You have 600 or so comments here so I only scrolled a 10ish pages, but I spotted at least one of your comments downvoted to the point of being grey, on each page. Sometimes more. That is pretty high, plus the recent flagged post. And now this thread has been flagged. Plus the meta threads.

Pick a random user, check out their comments and see how many of their posts are greyed out, for a comparison.

Have you made side accounts? That is another thing that seems to get people blocked or limited.

As other say, don't take it personally, and don't stress - there is more to life than hn!