The best sign that most of my connections don't even really follow me and may actually have blocked me without also disconnecting from me:
I pile up more and more atrocities from Mastodon's point of view in my posts. Way over 500 characters. Detailed image descriptions in the post itself where they don't belong. Text formatting. "Content warnings" that start with summaries and grow longer than most tweets. Lots and lots of hashtags, including truly weird ones.
But fewer and fewer people complain.