I've been playing for almost two years, and a couple of things keep it wonderful for me.
First, I have a love of excellence, and as importantly, the pursuit of it. I love getting better, and getting better is on the path to getting excellent. I get a lot of joy and satisfaction from doing something as well as I could have at the moment I did it. So, the fact that I have not yet achieved an objective standard of excellence at piano is just not any kind of problem for me.
Second, I have accepted that along my journey I will continually be at a point of not being as good as I will become, but better than I was before. So, some contentment is in order, always. To keep the beauty of music around me all the time, I spend considerable time exploring YouTube and the local book stores for interesting, enjoyable, and beautiful music to play and listen to. I have found many little treasures, within or just beyond my limited playing ability, and I have countless happy hours learning and enjoying them.
Third, and related to the second, play music that you love! Play music that you love! And, play music that you love! If standard repertoire doesn't excite you, do yourself a favor and move away from it, and toward music that does excite you. You deserve it!
Good luck finding a happy way to piano!