I agree with you entirely. The best I've heard it summed up is that MCU after Endgame is like playing through the remaining side-quests after beating a video game.
I'm enjoying some of the movies and series about characters I already liked as stand-alones, but the connecting tissue just isn't the same for me. That said, I really hope they turn it around! I'm rooting for Marvel to capture me the way they did with the initial run.