Did you check, that your MB and your CPU is capable of running a 4000MHz RAM?
32GB is more then enough, RAM speed is important, but the main problem atm., is that the multithreading of MSFS isn’t really using all cores.
I think this RAM will not help you, you will maybe gain 2 or 4 FPS, but only if the rest of your hardware is compatible with a 4000MHz RAM stick.