Hi Janet,
The simplest way to start over is to delete the Roon folder from all your devices, and reinstall it as desired.
This KB page describes the location of the folder for various operating systems.
@Martin_Webster posted this link in the other thread.
If @support can confirm that Roon supports embedded ID3 data in wav files (I believe it does, but let’s check) then you could convert your existing Naim metadata into ID3 form using SongKong, and then choose what to prefer on Roon import.
I’d suggest making a small test directory of 20 or so sample albums, converting them with SongKong, and then pointing Roon at them while you play with import settings to see what suits best. When you’ve worked out which import settings are best for you then you can repeat the process on your whole library. That will enable you to work out what is best without waiting for the whole library to be analysed.