This is how I feel, as well. I was HUGELY invested in the MCU - the amount of hours I spent theory-crafting re-watching, discussing with friends - the MCU was the center of my pop culture existence, more or less.
But now with the multiverse, when EVERYTHING is canon, this also means that nothing is canon. None of it "matters" in-universe in a way that feels like it has real stakes from the storytelling perspective. And none of it matters to me personally, as someone invested in this fiction.
I feel like Marvel could have used the multiverse to have their cake and eat it too - tell cool one-off stories like Logan or The Batman without the weight of it being tied to canon and an over-arching storyline. Just say it takes place in a different universe. Feige is certainly enough of a Real One when it comes to comic books to have pushed through some really interesting creative stories.
Instead, the multiverse is just being used for "get as batshit crazy and throw as much shit at the wall as we can" it seems like, based off Spider-Man NWH and Doctor Strange spoilers.
With the way Marvel is setting up its multiverse storyline, I really don't see how anyone can care about any of it. From a narrative standpoint I half expect them to crash the multiverse back in on itself into a single universe, or at lease close all the doors between universes, and just use all of this story junk as an excuse to pull in the X-Men, Fantastic Four, and other Fox characters. Because if there continues to be access to infinite universes, none of this matters. But then the other half of me expects them to keep using the multiverse as an excuse for recasting, and keeping everything going forever.