I’ve found that Lemmy tends to be about 50% more chill than reddit, but it definitely has some similar challenges. I try to be positive on a personal level and try to support others who I see doing the same.
In my experience so far (just a few months) Risa has been one of the most friendly places on lemmy - maybe it was just a full moon or something? Whatever the case, I say positive people are always welcome.
I try to upvote most things I see, especially if someone took the time to comment under one of my posts.
If I downvote, it’s usually because I see someone is actively being rude or is trying to steer something light into something controversial to bait arguments.