samgar,
In my prior post I asked which sources you used. This is important because if you had analog sources then a good solution becomes more complex. But I see you are only talking Roon, so that simplifies things.
As noted above, "solutions" can be as simple as implementing a parametric eq by ear on Roon to the DEQX-HDP4 soma mentioned. Of course with varying results.
The DEQX is probably the best solution, and also the most expensive.
But you have Roon that can convolve digital filters that were taken to correct for the room. Their effectiveness is directly connected to how those filters were developed.
I use a software called Acourate. Quite sophisticated and time consuming to learn, as it's super flexible. You need a mic and and mic pre, and analog to digital conversion. I generate the correction filters, then run them through HQPlayer in my audio computer. And have Roon in another computer feeding HQPlayer the music. Sounds amazing. The solution I think is on par with DEQX, depending on what hardware you use. Dirac is another good software solution, easier to use than Acourate, but less flexible.
But then someone mentioned there are services doing the measurements for you, so they could bring mic, pre and ADC, take the measurements, do the corrections, and provide you with the filters for you to convolve in Roon. That might be a good first step for you.
In my view well implemented digital room correction is hard to beat. I wouldn't live without it. As usual, implementation is the key/tricky piece.