Then my buddy said, “It’s just like riding a bike, you never forget how.” But this isn’t really how skills work. As I heard someone once say, “skill is only for rent” you have to keep up the practice and the doing to get better–or even to remain good at it.
You can’t break off you drawing skills once a year and expect to be as good as when you were practicing every day. You can’t do that with anything whether it’s being a good photographer or being a good friend. Consistency and practice are what will make you better.