All these things that I have done

I think this is why we specialise in stuff. it would take a tremendus amount of time and effort - more than anyone in fact has - to master everything interesting in the world. I have one, maybe two fields I actually know something about but that doesn't stop me being an interested spectator on other stuff, and it's still possible to have interesting conversations on the "intelligent layman" (woman, person, thing)level. The people that actually know about other stuff in depth probably don't know anything about your field.