I think we will need some more information. For example which plane do you used etc.
But my gut feeling tells me that everyting is correct and you will be not get much better performancr based on your CPU.
I had until a few days ago a Ryzen 7 3700x together with a 3070 TI and was able to achieve solid 30-40 FPS or even better with GA aircraft on HIGH graphic settings with 1440 resolution. With a study level airliner like the Fenix and on a busy airport I was below my treshold and often changed even to MEDIUM details.
Now I have upgraded my PC to a Ryzen 9 5900x.
So you are definitely CPU limited.