How good can it get, really? - my stereo sounds amazing!

I really love my stereo currently. I keep thinking I should be looking for the next piece to upgrade - phono stage, stereo subs, etc., but honestly not sure what to change or why I’d potentially spend more money to achieve a result that’s lesser or equal to my current sound quality. I sorta feel clueless as to how to proceed without screwing up what I have. I know it can get better but honestly I’m at a place when I just don’t know how it can. Hmmmmm.... not a bad problem I guess. Open to suggestions for sure. Thx.