Any way to have my MacBook Air clear caches automatically?

If it's storage you're after, Apple menu > System Settings > General > Storage shows recommendations, and there's an option to empty the Trash automatically after 30 days. That does more than clearing caches ever will.

you don't really need to. macOS manages its own caches and clears them when space gets tight, and wiping them just makes apps rebuild everything and run slower for a bit. what's the actual problem, low storage or something running slow?