I think people over estimate the Marvel brand. You can’t just keep unearthing dozens and dozens of niche characters and comics and expect them all to have an established fan base.
Think, Disney.
Ironman? Yeah no shit. It’s fucking Ironman.
Thor? Duh
Hulk? Yes, but get it right.
Antman? Pushing it but yeah he dope.
Captian America? Might as well said superman.
Gaurdians? Wonderful.
Captain Marvel. You lost me.
Eternals? …
It’s no mystery as to why not every franchise is going to be a hit. Just think about it.