I found success in starting our from an LLM positive poster and fanning out from their follows and building a follower graph. From there I fetch a few hundred of their posts and used an LLM to classify the posts as negative, mixed, or positive. I used this to winnow a set of follows. For now I just poll and generate a timeline HTML. This has yielded decent results.

But the problem with all of these Twitter clones is the political schism of Musk's acquisition has largely polarized the offshoots. You aren't just on alt-Twitter, you're on a specific polarized chunk of it.