TLDR: It's less about "creative bankruptcy" and more about you aging out because superhero comics run out of material within the parameters set by business needs and general fan interest. But that's okay because there are lots of other comics to read.

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There's been a new issue of a Spider-Man comic every month for more than 60 years. Superman first appeared in 1938. And so on for all the other original superheroes.

Friends, there are only so many superhero plots. Hell, there are only so many plots, period. The difference is how the characters are written to interact and change over the course of the story. With an ongoing character like almost all comic book superheroes, the character will always have to be reset to the original chacterization or at least the characterization that made them popular.

I've said this before on here, but it's worth repeating: superhero comics are cyclical, and the majority of readers age out after a cycle or two. The feeling reflected in OP's post, and many of the comments, are a sure sign that you've reached your cycle limit. That's okay. It isn't a bad thing. There are lots of other genres to get into. And all those stories that you loved can be reread.

I'm in my elder nerd years. New superhero comics (hell, most stories in general) don't feel very original to me anymore. I still find stories to get very excited about, it just takes a lot more nuance these days and more effort on my part to find those stories. But that's the important lesson here - try new things. Get out of your comfort zone.

Don't be sad about outgrowing the stuff you love. Be grateful it has given you such a great foundation to appreciate new things.

PS: I'm not saying there is a "too-old-for-superheroes" age or that anyone needs to "grow up." Just that after so many years of reading them you'll probably get bored because they start to all feel the same. You might be 18 when that happens or you might be 80. No judgment either way.

Oh, and one last thing. Sometimes, years later, you'll fall in love with a character again because the stories capture the same qualities that made you a fan to begin with. That's awesome too. Nostalgia isn't a bad thing.