So this happened:
I looked at the policy page on it, and I still don’t know what I’ve done that constitutes spam, deceptive practices or misleading content. I appealed it, and received an automated response saying that my account will stay terminated. I could be more persistent, but considering all the controversy around YouTube’s censorship and demonetisation, I’ve decided to move to a LBRY, a less restrictive platform. I’ve uploaded most of my videos, and the rest will arrive soon.