OK, folks! I cannot follow anyone else. I've reached my limit so that is sad. 
I don't know why there is a limit. Anyone know?
@MicheleV_AK As others have pointed out, it's an anti-spam measure. After following 7.5K people, you need to have more followers than you follow.
@Gargron@mastodon.social is that possibly too simplistic of a method for detecting potential spammers? Maybe instead a percentage based mutual follower/following would be more reasonable?