Rocket is the only one left of the Guardians, well I guess Nebula is too if you wanna get technical. But Steve Rogers, Iron Man, Black Widow, Banner, Thor, War Machine, Hawkeye (I would assume), Antman/Wasp, all team up w/ Captain Marvel for a rescue mission perhaps?
HTF do Iron Man and Nebula get off of Titan? And don't forget about Wong. Does he play a big role in Avengers 4 with the time stone and all of that wizard shit? What secret backdoors does he know? Do the deaths prior to Thanos' finger snap become permanent deaths Loki, Gamora, Vision, or do they somehow come back too?