I had the same problem. After testing all the suggestions out there (tweaking settings and NVIDIA control, etc) I believe I have a solution that works well.
I see you have a NVIDIA RTX card. Although not selected automatically in Options/Graphics, I have selected the following with HIGH END and now enjoy 30fps (max in NVIDIA Control/3D/MSFS) and smooth. Flying over New York it did drop to 20fps, but recovered quickly. I tried ULTRA, but this resulted in a 4-5 fps loss, and the difference was not noticeable. Good luck!
