Yup. Diminishing returns.
Go to some listening rooms at a show or two, or at some decent shops. check out systems at 15k, 20k, 25k, 30k. Maybe a tad higher? But set a limit - no more than half of what you receive. Remember decent $$$$ down for treatment as that should be considered part of your system. See if there’s that much difference between them, but you may find yourself pretty darned happy with one not much more extravagant than what you had.
Invest the rest of your money and enjoy your peace of mind along with the music.