• Encourage other people - if you like the work someone is doing, tell them!
• Be positive - a feed full of negativity is zero fun to follow.
• Share what you're working on - people are drawn to other people in motion.
I also am very careful about who I follow. I don't "hate-follow" anyone. And I'm pretty liberal with regard to muting stuff.
There is a big trend right now (or always?) of people grifting on Twitter, and I mute every single one of those people. It's all the engagement-bait stuff that you're probably super familiar with. Questions that aren't questions, half-baked thought threads, and hot takes that are only there to gin up "engagement."
I recorded a podcast[1] with some friends recently about how to use Twitter as a human being and not a grifter. They were both super anti-Twitter and I was able to swing them my direction a bit. I think most people just follow the wrong people and get sucked into the hate machine.
There are definitely corners of Twitter that are a lot of fun and very valuable!
[0] https://twitter.com/aarondfrancis/status/1434287141887021058