Going back to watch any of the Phase 1 movies is such a better experience than any of the Phase 4 or Phase 5 movies. There doesn’t need to be endless excitement, there just needs to be decent writing, and that’s missing from anything new. Nobody cares about any of the new characters.
There’s never been a huge number of flops from marvel with people losing more and more interest in watching them. There’s no clear plan forward, as their planned “Thanos” scale villain has been in hot water irl and will likely not be able to continue to play the character.