Here are some tips I have learned from experience
Avoid picking Rigorous Danger Floors (especially if the objective is Splat Zones or if you are low on lives)
If your starting Palette does not give you a powerful way to fight Jelletons at a distance, change your sub or special weapon at a vending machine if possible
Prioritize your current Palettes most common color chip tones, if you can (do not neglect other tones)
On Splat Zones floors, try to splat Drizzling Capricciosos as soon as possible
On any floor, try to splat Towering Nobilmentes as soon as possible
I hope this helps, (: