I can speak to Nord specifically, which is what I use-
So every now and then Nord will eventually cycle out their individual IPs (although sometimes they appear again LOL); for example if I'm using a Chicago based one labeled "United States #2000" I will keep that in my history/top pinned VPNs and always use that specific one for that account. When it cycles out I just pick a new Chicago based one and haven't had any issues. You're on the same one long enough and then swap to something still regionally close that it doesn't make a blip, in my experience. Even swapping continents because I forgot or didn't properly write down the original region I accessed a shell from didn't have any negative effects (granted of course I'm not swapping back and forth across the globe every day lol).