So , after almost all main characters gone now what is next for avengers so , today I am going to explain every character who can be member of avengers, so lets start .
Scarlet witch - she is already member of avengers team and one of the strongest superhero in marvel , and in future she will be most imp member of marvel .
Old captain America- yes , he is alive and i think he will guide new avengers and train them .
New captain America- sam or new captain will be best candidate for leader of avengers and in his upcoming new series i think he will train himself.
Revision - yes , vision will come back because his disney plus series is conformed [ wanda vision ] so , some how he will be brought back .
Black panther- wakanda king he is also best candidate for new avengers leaders because he have that much leadership, tech , his sister and more than 100 time money than tony or iron man .
Shuri - she also have chances of becoming member of new avengers because someone have to replace iron man brain in avengers.
Professor hulk - half injured but still have brain which is most important thing for new avengers because they have mant powerful hero so , they need brain .
Thor - I don't think thor will return to new avengers as he now became a part of gurdians so, there are very less opportunities for him .
Bucky - sidekick of new captain [ 100% guaranteed members of new avengers]
Captain marvel - one of the strongest avengers and she can be avengers and gurdians at same time because you know , she cannot become new leader of new avengers because you know her behaviour in endgame.
Doctor strange- he is one of the strongest superhero and he is worth of becoming leader of new avengers.
Spiderman- after marvel-sony deal failure very less chances are that he will come back . 50-50
Hawkye - retire
So , i think I've done with all superhero who were alive after endgame if i missed comment down and thid don't include gurdians.