Like everything PCVR, your setup/settings are everything. Often it’s hard to to pinpoint issues since the combination of things besides msfs settings like nvidia CP, Win11, and meta-link pc app can have a pretty big effect.
The only time I’ve noticed flickering in the past I found that things that helped included; disabling HAGS and using DDU in safe mode before installing newer nvidia drivers, currently using 522.44, (including not installing geoforce experience), together with checking out your Link cable connection (meta-link app device/usb speed test = 2.2Gbps or better).
That is, you need a holistic approach, rather than relying on a simple on-step fix imho. Up to you but I suggest you have a look at my current Q3/QPro Link settings and give all (not just some) of these a go. Good luck mate and cheers.