The devmode fps counter will tell you if you’re CPU limited or not. I’ve been doing FS2020 VR since the VR patched dropped at Xmas 2020 but I can’t help you with 2024 as it runs terrible (vs 2020) on my 7800x3D, 4090, 64GB too.
Ideally you want an x3D CPU for this sim, but your system should be pretty solid for 2020. 2024, all bets are off currently for VR it seems. I get about 30% less fps vs 2020 and it’s a lot more unstable.
So my advice is go back to 2020 for now, it’s a great sim and runs much better. Until they fix it (I got a refund, probably until some time next year.).
Although 3fps is extreme, it shouldn’t quite be that bad.
Most important thing is to aim for fps of half refresh rate and lock it there with RTSS. In 2020 that’s easily doable for your system even with a Crystal Light.