We expect that once we master something it will always be easier for us. Except it doesn’t work like that. No, usually we become rusty.

To maintain mastery, you’ve got to use the skills you’ve gained. Otherwise they rust from lack of use. No different than being fit enough to run a marathon and then spending six months without exercising. You’ve got to regain what you’ve lost.

Don’t expect to pick up where you left off. Expect to put in long hours to get back to where you were.