Avengers: Endgame's time heist brings 2014 Gamora to the prime MCU timeline, here's where she might have gone following the defeat of Thanos.
Here's every possible place Gamora went to after Avengers: Endgame as will be revealed in Guardians of the Galaxy Vol. 3. Following her death in Avengers: Infinity War, Marvel Studios was able to find a smart way to bring back Zoe Saldana's character in the MCU through time travel. That said, considering that the current version of the hero that exists in the primary timeline doesn't have the same experiences as her dead counterpart, it's understandable why she wasn't keen on joining the Guardians of the Galaxy.
Despite being Thanos' favorite adopted daughter, that didn't spare Gamora from becoming collateral damage in the Mad Titan's quest to balance the universe through the Infinity Stones. As the only person who knew about the location of the Soul Stone, she was dragged by her father to Vormir to acquire the valuable gem. What neither of them knew at the time was that the Soul Stone required a sacrifice to be paid before it could be collected as Red Skull - as the Soul Stone's cursed guardian informed them. Deciding then and there that his self-imposed mission was more important than Gamora, Thanos didn't think twice about throwing her off the cliff in exchange for the elemental crystal.
Endgame's time heist, however, allowed 2014 Gamora to come back into the main MCU timeline, essentially taking the place of the version of herself who's already dead in that reality. But while they're the same character, only from different points in their lives, this new Gamora doesn't know about her association with the Guardians of the Galaxy or her relationship with Star-Lord. The theatrical cut of Endgame didn't reveal whether 2014 Gamora was evaporated by Iron Man's sacrificial snap like Thanos and all his minions from that timeline and a deleted scene confirmed her survival, although she took off by herself with her whereabouts currently unknown — something that will be revealed in Guardians of the Galaxy Vol. 3 instead.
Gamora's home planet was initially perceived to have been destroyed and her being its only surviving native as revealed in James Gunn's Guardians of the Galaxy from 2014. But, as Marvel Studios further explored her backstory in conjunction with Thanos' arc in Avengers: Infinity War, it was revealed that Zen-Whoberi actually still exists, and according to Mad Titan, it is even thriving after he decimated half of its population and took Gamora away from her family. With her adopted father now dead, Gamora is free to do whatever she wants, including going back to her homeworld and perhaps even try to see if he has any other relatives who were spared from Thanos' random genocide.
For someone who's clueless about the life her main MCU timeline counterpart had, Gamora returning to what she knows is an understandable choice for her in Guardians of the Galaxy Vol. 3. It gives her a sense of control over her life since she's in familiar territory. Granted that she supposedly hasn't been back since the Mad Titan abducted her, but still, being back in Zen-Whoberi could help Gamora rejuvenate and gear up for tackling the adventures she has ahead.
Avengers: Infinity War didn't show Thanos and his minions taking over Xandar in the hopes of acquiring the Power Stone. Instead, the film opened with him already with the purple gem, with what happened on the planet only belatedly revealed. Aside from taking down the Nova Corps, the villain also executed random genocide on Xandar, leaving only half of its people. This means that like Zen-Whoberi, it still functions and might be Gamora's destination after the events of Avengers: Endgame. Given that it's the primary setting for the events of Guardians of the Galaxy, Gamora may want to retrace the steps of her main MCU timeline version. Guardians of the Galaxy Vol. 3 having all the core members of the titular cosmic group back in Xandar would bring their adventures full circle considering that not only it's where they met, saving the planet was also their first collective mission as a superhero group. Who knows, it might even be a great narrative opening to the stealthily plant seeds for Richard Rider/Nova's MCU introduction if that's in Marvel Studios' plans.
With the time heist bringing Gamora to Earth, there's a possibility that when Guardians of the Galaxy Vol. 3 picks up, she's still on the same planet. Iron Man's snap decimated Thanos, the Black Order, his other minions, as well as, the ships that they were using and with that, Gamora doesn't really have any means to leave Earth unless she secretly hitched a ride with someone else who was also headed off-world. If she's indeed stuck on the planet, it could bring Star-Lord and her other friends back which would be particularly interesting for Peter Quill considering that she apparently didn't like that he returned to his home planet as it evoked bad memories. It's also worth noting that given that Avengers: Endgame ended with the Guardians of the Galaxy with Thor, and with a new Asgard established in Norway, it's not outside the realms of possibility that they all somehow make their way back to Earth anyway. Taika Waititi's Thor: Love & Thunder is expected to see the God of Thunder with Star-Lord and company.
Depending on how much prime MCU Nebula told 2014 Gamora about the death of her 2023 counterpart, Guardians of the Galaxy vol. 3 could see her revisit Vormir. As she's unaware of everything that's transpired in her life before she met Star-Lord and the rest of her cosmic team, Gamora could be keen on learning about what her other version had gone through before her heartbreaking death in Avengers: Infinity War. Since the Soul Stone in the main MCU timeline is no longer there, Red Skull may have already left the place; as the filmmakers suggested, once the gem was retrieved, he's n0 longer bound to staying in Vormir. But, if they want an expository vehicle who could recount what really happened that day she died on that planet, Red Skull is Marvel Studios' best bet considering that he's the only other character who witnessed what happened and that is still alive.
Admittedly, this is a tricky narrative to navigate; even if 2014 Gamora is informed of prime Gamora's overall narrative, she's essentially a different character. It's curious how Marvel Studios move forward with her character given this switch. Then again, considering that Gunn was informed of the heroine's arc in Infinity War and that the script for Guardians of the Galaxy Vol. 3 barely changed despite the film's significant delay, it's safe to assume they have a game plan in mind for this new Gamora.