Well, actually it isn't just WandaVision, Loki, and What if?, there are the other shows too. Hawkeye, Falcon and the Winter Soldier, Moonknight, Ms. Marvel, and She-Hulk. (sadly those two are actually Marvel shows.)
There are also the movies, Black Widow, Shang-chi, and Eternals (which, yes, are all a part of Phase four), along with No Way Home, Multiverse of Madness, Thor: Love and Thunder, and even Wakanda forever is a part of Phase Four still. So there were actually quite a few movies in Phase Four.
And to be completely honest, I am realllllyyy looking forward to Quantamania, if only because I love Scott so much.