I'm pretty similar. I'm probably more generous with upvotes. I'll also downvote:
any link without a description
YouTube links
Twitter reposts (that's usually on reddit, though)
I have to force myself not to downvote anything with anime. I have a visceral dislike for anime, probably a result of the shitty afternoon TV cartoon lineup in the 70s.
I block a LOT of accounts. Anything that looks like ragebait or just arguing in bad faith.
I understand the intent behind downvoting Youtube posts/comments, I did before aswell, but I suggest kindly that you don't.
Some people have set up plugins or extensions to redirect to Piped or Invidious. And it is nice to have the Youtube link to share amongst non tech savy people.