IMO, painting those gawd-awful eggplant-colored walls would brighten it up a lot, too.
I’m guessing that the walls in there cover about 350 square feet - 1 gallon if we’re real careful. I’m also guessing we’ll need two coats to cover the purple. Since I’m a cheapskate … maybe we can get two gallons of “mismatched paint” dirt cheap at Lowes or Sherwin Williams. The two gallons don’t have to be the same color - one coat of something light to mostly cover the purple and one coat of something else light as the top coat.