There's a light novel with this premise titled Didn't I Say to Make My Abilities Average in the Next Life?!
For lighthearted stuff, can’t go wrong with anything by FUNA:
Didn’t I Say to Make My Abilities Average..?
Saving 80,000 Gold for my Retirement
I Shall Survive Using Potions!
I also recommend Walking My Second Path in Life ; a mistreated princess disguises herself as a boy knight in training, makes friends, and has the time of her life.