Best way to categorize your Vinyl collection

I'm sure this was probably posted before but, whats the consensus?? My albums are in alphabetical order (according to artist) and I find it to be a PAIN to try to find any thing! My eye sight is getting worse by the day!!
I'm thinking maybe to do it by "era" or "type of music" be it 70's rock, psychedelic, Southern rock, Folk, Jazz, female vocalist ect.... Perhaps a category for best sounding recording...?? What works best for you??