On the other side, wasps could be so tiny. like you could put thousands of them inside an amoeba volume.

"Megaphragma mymaripenne is a microscopically sized wasp. At 200 μm in length, it is the third-smallest extant insect, comparable in size to single-celled organisms. It has a highly reduced nervous system, containing only 7400 neurons, several orders of magnitude fewer than in larger insects."

The males of dicopomorpha echmepterygis are even smaller, with wide sexual dimorphism: https://en.wikipedia.org/wiki/Dicopomorpha_echmepterygis

I never knew about these either.