I truly think Guardians Of The Galaxy 3 is really not the end of the trilogy but I think this is the beginning for Marvel to begin promoting the brand new characters into new projects. Like I think Cosmo will star in his own cartoon series and in the future we will see an Adam Warlock show being made for
Disney+ and Star Lord and Mantis will have their own series too. Because as we saw with Groot when Guardians Of The Galaxy first debuted Marvel saw a character that could easily become a huge celebrity and when Guardians Of The Galaxy 2 came out they repeated the same thing with Baby Groot and now Groot has become a big time star for Marvel. Why I think they created Guardians Of The Galaxy 3 was so that Marvel could start adding new characters into future projects and it worked