How do you organize your music?

I have a problem where I have one mega playlist over 190 hours and a couple smaller ones. Shuffle does me dirty on the mega playlist. Also sometimes I switch apps.

Do you guys have a playlist for each era or subgenre you want to listen to?

How do you tackle this issue. I feel like itll take me hours to organize the mega playlist into more consumable form based on what i feel like listening to