The last few times I’ve found music I like via a method that was repeatable was searching through tags on Bandcamp. If I was listening to something I liked, I could look at the tags (electro, downtempo, big band etc) and click a few of those to find similar music. As far as a filter for quality, the number of followers for a page might be a decent metric because the genres are extremely precise and niche, and most of the biggest artists don’t self publish. There’s some amazing stuff on there to be found.