not unlike reddit where the first thing you should do is unsubscribe from every single default subreddit (if you visit the home page at all, anyway) - this has been true for as long as I've been there (a decade, and I haven't really visited for the past couple years)
If you don’t like how the algorithm works you can write your own (that’s what feeds are - custom algorithms).
I don't like the format used by X, BS, Mastodon and all the others so I do not use any of them but I do passively partake of what is posted on them. In practice this comes down to probably 95% X, 5% Mastodon/Pleroma and that's it. I have yet to find a BS post of interest and won't use Threads because I don't do Metafacebookthings.
However, it’s not just that. If you want to see more tailored content you have to follow people. Expecting to see anything other than the most currently-popular posts when you’re not following anyone and haven’t set any preferences is frankly ridiculous.
One thing I will say though is that although BSky has good science and arts communities the tech community seems to be sticking with Mastodon.