Start with definitely posting at least once a week and counting anything on top of that as bonus? :)

I moderate (to some value of moderate x_x) Artbees (we're very casual and free and easy) and OnChainArt (we're somewhat strict on quality standard and probably the most rules-heavy art community to date), that might get you started somewhere :) The communities page has a search function which might help you find more areas of interest.

_{They will redirect you to the peakd interface if you're not using that already}

If it's any consolation I haven't figured out how everything works yet either.

_{I have also not really looked because I keep doing other things}