Along the lines of what @jl35 states- I used an Oppo for spinning disks a few years ago as well, it eventually wore me down. I can put up with it for a short period of time then I have to turn it off.
As for DAC’s- while there are differences in the levels of performance and quality (generally) with the more you spend I don’t believe the improvements follow the same scale once you pass a certain point (diminishing returns). Only you can justify the value of the expense once you’ve experienced the difference.
When it comes to moving on from the Oppo you could move in the direction of a device that rips your CD’s to internal storage and streams Tidal/Qobuz content. The Innuos Zen MK3 or Aurender ACS-100 are a great place to start and I believe both of these sell for under $4k new. You can frequently find these on the used market as well. Happy Hunting!