I had a bit of a slow start on Mastodon, but after sticking with it for a while it's now by far the best social media experience I've ever had. I follow less than 200 people, not all of them active, but their posts along with the content they boost provides a much more interesting feed for me than any algorithm ever has.
And when I post something I've put work into, it's boosted by those interested and reaches far more relevant people than I've ever reached on other networks. And people trust it to be interesting because it's boosted by someone they trust, rather than some faceless algorithm.
That said, the cost of entry is indeed a bit high.