That’s a beautiful composition! I agree with you, once you stop practicing the most common thing that happens is forget almost everything. When I was a child and stopped practicing piano, I forgot all the classical music that I ever learned. So it’s all about practicing and practicing.
Oh, you forgot the classical pieces you have been learning. But, know you have the technique to play other stuff, what you like :))
You just transformed into another genre and it is great 😀