Graduation is when they stop assigning homework. It was never when the learning was supposed to stop.

School supplies the structure, the deadlines, and the person deciding what is worth knowing, so when that ends it is easy to read the absence as completion. Nothing about your capacity changed on that day. What disappeared was the scaffolding, which means the choosing is now yours. Most people never make the switch and simply stop.

Decide now what you would keep learning with nobody assigning it, and give it a place in an ordinary week. One subject, one regular hour. The habit is far easier to keep than to restart, so it helps to have it before the structure goes.