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PSA: Mastodon is NOT Twitter and does not aim to be.
What you are describing about Twitter wasn't my experience with it at all. I just followed my friends, interesting people I met at events, etc. I wasn't looking to be connected to influencers or whatever was the popular chatter of the moment, and I freely used the block feature to filter out people who posted stuff I wasn't interested in. It worked just fine like that. Decent experience (too shallow for my preference, due to the nature of the platform, but not unpleasant).
I feel like most social media platforms are, to a large extent, what you make of them. Like my Facebook feed is pretty nice. It's about 60% family and friends that I like, 20% interest groups (kayaking and hiking mostly), and 20% ads for stuff I'm interested in (mostly authors right now). There's none of the toxic bullshit that a lot of people complain about.
So yeah, I agree with the 'follow people you are interested in' advice, but that's not unique to Mastodon or Lemmy or whatever.