I'd say its unlikely. Both RDJ and Evans are done playing the characters and Marvel have said they're done if those two are done. Its possible that there maybe a sort of Variant cameo in a film or TV, but I don't see anymore Iron Man or Cpt America films. In terms of Phase 4 Films: Black Widow Shang-Chi Eternals Spider-Man: No Way Home Doctor Strange in the Multiverse of Madness Thor: Love and Thunder Black Panther: Wakanda Forever The Marvels (cpt Marvel 2) Ant-Man and the Wasp: Quantumania Guardians of the Galaxy Vol. 3 Fantastic Four TV: Helstrom WandaVision Falcon & Winter Soilder Loki What If...? Ms. Marvel Hawkeye Moon Knight She-Hulk Secret Invasion The Guardians of the Galaxy Holiday Special Ironheart Armor Wars There is also a Wakanda Series and a Hawkeye Spinoff in development Think the untimate end goal of Phase 4 will be to setup a move towards the X-men.