I'm a fediverse supporter (obviously, that's why I'm here), however what you're looking for requires a critical mass of users that the fediverse (at least the Lemmy side of it) will never achieve as long as two very critical problems persist:
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sign up is confusing. People are used to clicking "create an account," inputting a user name, password, and maybe an email, and then BAM they're a user. I realize the whole instance thing is the entire point, but no one wants nor expects to have to do significant research and make a decision about how they want to interact with a social media site before they've even started using it.
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the site (or at least lemmy.world) is sooo slooow. Basic functions like loading images take me back to the dial-up era of "click the image then do something else while it loads," which is downright ridiculous in the 2020s. Again I've stuck with it because I want to support the fediverse, but 99% of users won't.
And no, these aren't "features not bugs" unless you want to keep the site small and homogenous.