This is gonna sound silly, but dishwasher. I got a small one only this year after many, many years of being the dishwasher (and not cooking as much as a result). But since getting a dishwasher, I've been cooking loads. It's genuinely amazing the difference it makes, knowing that you don't have to leave a big pile of stuff to clean up later every time you cook. I can even put my whole air fryer basket in there!
Plus it uses a controlled amount of water for the whole load so you aren't running the tap constantly and wasting water.