If you need good ideas, don't ask HN, you won't find any of that here.

Sit down with no distractions other most a pen and a piece of paper, for an hour and write down your ideas. Next day, check if your ideas suck, and if they do (they probably do), repeat step 1.

Also a quick note about entrepreneurship: stop thinking of opening "side business". If you want to succeed, the business has to become your main thing, any job you keep to put food on the table has to become the "side job".

open a nightly open mic venue, a lounge for local artists. might be best if you get a liquor license ($$$) but it's not strictly necessary if your venue is genuinely nice, luxurious, or maybe it's more of a vape lounge. foster up and comers and provide a place for artists to network. maybe have a karaoke night, a comedy night, etc..