There is a honeymoon phase after the check ride. You have that new certificate or rating in your pocket and it is natural to want to relax and do some fun just-for-you flying, like buying $100 hamburgers, make fly-out camping trips, attend fly-ins, and take trips to visit friends and family.
The fun flying continues until you realize that it has been a while since you practiced a skill—like stalls or steep turns—that you learned months, perhaps even years earlier, and you’re a bit fuzzy about the setup and recovery.