There is no “too active”. Participate genuinely in discourse, and don’t be a spambot or clickbait poster. I think that’s really all anyone wants, regardless of if it’s Lemmy or another service.

As someone that’s been here a while, Lemmy a few years ago used to be a once-a-week thing because there wasn’t that much content. Now I have no problems using it multiple times a day and always see new stuff.

So, engage at the level you’d like to, and know that your engagement is driving others to consume and participate also.