Marvels' problem is that all the pre-Endgame films were interconnected and built to something. The films after that seem disjointed and incoherent. So people don't know how this film connects to anything else. Marvel didn't make films that just stood on their own, so the audience isn't looking for that.
My proposal to Kevin Feige would be to create a "Marvel Team Up" series of films, which are self-contained stories involving two characters from the MCU who don't usually work together, or who had very little interaction. You could, theoretically, tentpole it with Spider-Man, but it could just as easily be Captain Marvel. You could even do it as a crossover with other franchises.