i would return the molly, which will get too big, and the cories, which need to be in a school. get more guppies, and if you are good at keeping the watre chemistry stable, then get an oto for cleanup.
50gal planted - yoyo loaches, BNs, odessa barbs, giant danios
33gal planted - praecox rainbows, gold ram, bolivian rams, sparkling gouramis, licorice gouramis, lots of shrimp
2 x 5gal planted - bettas