Oculus tray tool is a must. A setting that helps FPS the most is limiting the FOV since the game renders more screen than the quest needs.
I don’t know your hardware, so I suggest you check this thread. Read the very top, then read the very bottom and start to fiddle with your settings until you hit that nice spot. Takes a while but it is worth it. Good luck!
https://forums.flightsimulator.com/t/tnt-quest-2-settings-sharp-and-smooooth/367530