Do you tag your music? What's your method?

I started the monumental task of tagging all my music for the purpose of organising but also autoplaylist generation. I decided to tag only by genre because it suits my listening behaviour (e.g. I feel like reggae, so I pull up my reggae category and scan through album art till I find something that fits my mood).

I've started tagging and retagging a few times now. I haven't quite figured out a method that works. I started off too specific (many subgenres with few artists in each), then too broad (hundreds of artists per genre). The sweet spot is elusive. I've been doing this work manually, but I've also had the idea of scrapping RYM because I've found this source to be fairly similar to my own judgment. The idea of automated tagging is appealing so I can "let the gods decide" and reduce the mental tax.

Anyways, please share your methods! Im sure someone has "solved" this delimma. TIA