I am banned from the Canada community and I can't block it from my main feed

You can block communities under settings, under your name. Also know that some communities show up mirrored on different servers, so you might need to block it more than one place. Probably not the case for Canada, though.

What the heck did you do to get banned from Canada of all places?

edit: Hang on a minute, this looks like a bot account. Account was inactive for over a year and only posted within the last week, and in quick succession too. Most of the posts revolve around generative AI and, weirdly, the comparison between the beef/oil/etc industry and data centres. No wonder you got bammed