Most people are not talking about self improvement and fixing themselves everywhere.
Most people don't even know they are on the path to implosion.
It's only because you're on this part of twitter that you're hearing about entrepreneurship, nutrition, copywriting, mindset etc.
This goes to show how powerful the internet is.
Pre-internet era, you could not get information nearly as easily. If you wanted to improve, you'd basically have to find someone to mentor you, and even they have limited time.
This community is maybe half a million people big.
Meanwhile, twitter has ~300 million monthly active users.
Most people are still just talking about movies, celebrities, tv shows, politics etc