No doubt there are lots of good suggestions in this thread, but also lots of bad ones. If one is experiencing consistent CTDs, something is very wrong. It's almost surely not MSFS per se, nor is it the lack of huge VRAM, etc. MSFS is over two years old, has millions of users, and has been extensively updated over that period of time.

Empty that community folder, dump all of the hand-crafted liveries, airports, etc., and get things stabilized. Work from there. Around 18 months ago, I had a period of CTDs and decided to reinstall MSFS. Everything has worked fine since. If that had failed, I would have done a nuke and pave on the entire file system, with a clean install of the OS. If that had failed, we would have had to look at hardware issues.

We've had 50 years of experience testing and debugging computers, and the old rules still apply. There are no secret nostrums nor magic solutions. These things can be hard to find and sometimes harder to fix. Good luck.

Figured I'd try another flight today.  Did a hop from Savannah to the shuttle facility (KTTS), and it went off without a hitch.  Good thermals (both for my GPU and CPU), frame rates in the 50s.  Not sure why sometimes things work great, and other times MSFS just quits.  I did have to install an update before flying, so not sure if that helped anything.  Weather was pretty clear, so probably made for a bit less work for the PC.

But it is fantastic when it works.