In my experience, in the vast majority of cases, where a CTD occurs, the most effective cure/diagnostic will be to clear addons from your community folder and add them back until the CTD recurs.
Identifying the “guilty” addon might be made easier if you have recently installed something and you weren’t getting CTD before. Otherwise, it might be a case of adding your addons back one at a time.
I’ve recently been getting CTD and it looks like its an airport scenery from flightsim.to that is causing the issue. I removed it and the CTDs went away, but as the CTD only happens as MSFS is starting and doesn’t seem to cause mid-flight CTD, I’m going to put it back until my Fenix A320 tour of capital cities has moved past it.