Assuming you have PS-Plus, just make sure all Application Data is synced up to the PSN servers and then you can sync it back down again to the PS5. Your CMDR save is on the FDev servers, anyway, so it’s actually only your settings (keybindings, etc) that need syncing this way but those would be pretty annoying to lose, for me at least!
I switched a month or so ago and it was seemless: running on Quality settings with frame rates as good or better than I got on the PS4-Pro on Performance, I would say.