Most online spaces can start to feel bad when you spend too much time on them. Even spending too much time on an app like Bluesky -- much less of a dumpster fire than Twitter these days -- has a tendency to unearth things you would rather not engage with.
This is partially because too much time spent online just isn't good for anyone -- too much of most things often leads to negative, unwanted consequences. But it's also because the importance of community, especially on the internet, is still highly significant despite the fact that social media often has a tendency to make such communities obsolete.
Algorithms on platforms like Instagram and TikTok may seem to "know" the types of content you prefer to view. But they very rarely connect you with specific groups of people who rally around that content. Often you have to go to places like Discord or Patreon to interact specifically with the people you want to make connections with surrounding a subject or person.
This doesn't account for the fact, however, that algorithms will still prioritize content that is meant to generate strong reactions. So no matter how much you think you've curated your feeds to only show you "good" things, the opposite will almost always find its way to you.
This does not mean that good people and communities and causes don't exist online. We just have to make an active effort to find and engage with them. We simultaneously have to make an effort to refrain from engaging with content we don't want to see -- we continue to see it because we continue to interact with it. Stop it!
You can also, as cliché as it may sound, be the good you want to see more of online. Set an example for those around you. When we put into the world (or the internet) the things we want more of, we're doing something to change things for the better. That matters. Never forget that.