I also use dirt more than one season, trying to discard any fine dusty portion ( if it's dry enough to) and adding something for structure/ drainage. I'm no pro but do well enough to justify my stingy ways. Potentially fussy plants and seedlings get fresh stuff. Beasts like Alocasia can get whatever with roots and junk. And I never sanitize, scrub etc. Though I don't like the look of that yellow crust on the bottom of your pots. That I would scrub off.
