Yes, that is a recognizeable dilemma. When all the reading, testing, trying, buying, installing, tweaking and critical listening for changes is over ... well ... then it’s over. Now your feet not only taps with the music, but also from impatience ... what now?
A friend and I, we built a model railroad. That was great fun. Until it was ready. When the building is done, all one can do is drive trains around and that quickly becomes boring. Solution ... we’re breaking it down and start building a new one.
This can become expensive in the case of high end audio.
A new hobby could be to get a good measuring microphone and skill yourself in the art of room acoustics measurement and -improvement with the very nice roomeqwizard software. https://www.roomeqwizard.com/
Some very nice sound improvements may come of it ...