You can have all males so get more male guppies and platies (although platies are good at changing sex when required).
Most small community fish will go with what you have. Harlequins or other rasboras, cherry barbs, pencilfish, rummy noses, cardinals, glowlights, lemon, yellow, phantom, emperor, black widow or bleeding heart tetras, pristellas, danios, etc. Not tiger barbs though as they tend to nip tails. Rosy barbs should be ok though.
Lots of others but what we can get here isn't necessarily what you can get there.