So what’s my best bet on cleaning this up?

Hey guys, I’ve just completed my first prints. The top surfaces and sides came out really good, but the undersides came out a little rough. Especially where supports were, what’s the accepted standards for cleaning these areas up? Sandpaper, files, dremel?

What settings should I be looking at to make my next prints even better in these areas?

My setup: Qidi xplus3 Sunlu PLA + 2.0 (using its default filament profile in orca) @ 230/60 300blkfde’s orca/machine settings. 12 walls, 80% infill. Layer height: .2 Support distances: .19

I appreciate the feedback!