I just went through the same myself (got a new PC) - for MSFS settings you don’t have to copy anything as @Neo4316 said, they are stored with your Xbox account. One thing I found though is that all my custom cockpit views for the WT CJ4 were gone in the new install, although I copied over everything from the mod in the community folder. Finally found that those weren’t stored in the cameras.cfg of the mod install folder (which also does has the cameras.cfg), but in the MSFS installation itself at C:\Users\xxx\AppData\Local\Packages\Microsoft.FlightSimulator_8wekyb3d8bbwe\LocalCache\SimObjects\Airplanes\Asobo_CJ4.
So maybe a good idea to make a copy of the Microsoft folder somewhere so that you can get back any files in case you need it.
As to the reinstall of all the addons / flight sim utilities, a move is a completely different story, and was a PITA 