9. Unfollow people who are too noisy. Even your real-life friends and family. If you put them in lists (you did follow #5 above, right?) you can still see all their things by clicking on the list. But your main feed will get dramatically better.
10. Check your event page at least once a month. Make sure you decline things you aren’t going to and accept things that you will. That makes those events go viral and helps everyone’s calendar out.