1. Don't be afraid to swap actors
Comic books are filled with multiverses and counterparts. There have been so many stories in the comics, films, and shows about how many different versions of every character there are. Characters that look the same as their counterparts or completely different.
I loved Black Panther and was hyped for Black Panther 2 until I found out it was going to be led by Letitia Wright, someone who was hardcore openly trying to convince people not to get the COVID-19 vaccine. Same with why I never saw Quantumania because Evangeline Lilly was doing the same. Covid killed over 3 million people so trying to pretend the people on my screen were heroes was not something I could stress my mind to do.
It took Marvel forever to get rid of Jonathan Majors despite the overwhelming amount of reasons why they should.
Jeremy Renner, pre-snowplow was one of the craziest. To use his fame to promote his band is annoying but not necessarily bad. It's something any actor can bounce back from, just ask Keanu about "Dogstar". But Jeremy also introduced the Jeremy Renner app, an app that was just like Instagram if the only person you could interact with was the Jeremy Renner page. You could post comments by spending money and if you paid enough money on a particular post, there was a chance that "Jeremy Renner" (and definitely not some random guy running the app) would click like on your comment or even reply with something like "love it".
But here's the thing. Marvel wants to act like it's some invincible powerhouse but they still need to understand that these actions hurt their reputation as a brand.
Marvel needs to just be stricter. Comic characters are SO easy to swap out. When you introduce multiverses and time travel it's not difficult. In Black Panther: Wakanda Forever it would have been super easy to give the role of Black Panther to one of the masterfully trained Dora Milaje that Marvel has spent so much time beefing up popularity in instead of a kid who spends most of her time in a lab and occasionally fights with ranged weapons.
But, hopefully, Marvel does something because while I'm heavily suffering from superhero fatigue myself, I understand why and I'd love to see Marvel go back to its roots. The fact that I can watch the older films and still enjoy them says a lot about the fact that the genre isn't dead, it's just going through a weird phase.