I've come here a few times in the past year hoping to ask a question only to be reminded:

I dont recall deleting bad questions (and dont have the rep to see my deletions), and I've been using Stack Exchange for many years, paying attention to Meta, creating and reading Meta questions asking best practices, and while I definitely can recall a few guilty Stack Overflow questions where I was asking something too broad out of desperation to solve a confusing problem, I think my activity on SE is pretty mindful of quality overall.

Can someone with enough rep remind me what horrible deleted question lurking in my past here is the culprit of my permanent ban from the site?

My history looks otherwise pretty ok. Not great, lots of questions with no upvotes, but only 1 downvoted question of 11 total.