If your 3080 is at 100% you must be making big compromises elsewhere. A 5700X shouldn’t cost much more than $150 dollars, with undervolting at a pinch you could even use the Wraith Prism cooler that came with your 3700. With a 5700 or 5800 you should be able to (almost) max out everything including the LODs and not even worry about KLAX or Kennedy … fps should improve in most scenery for the same reason it does when you look up at the sky - less pressure on mainthread
PS. I upgraded from a 3800 to a 5800 and don’t regret the expense, and that’s just with an rtx3060 pushing out the the graphics (albeit not at 4k TAA).