How about…
If you can restart Roon with your trial email address, you could export (see this KB article) your playlists, either as files plus a .m3u file, or as a spreadsheet (which can be used to create a .m3u file if the music files are too big - see this link). Your could then start Roon with your new account, and import the playlists via the .m3u files (see this KB article)
A spreadsheet export can also be used to show your tags, so you would at least have a record, but I don’t know any way of re-importing them.
All this requires your trial period to be still valid, if not, you might have to go cap in hand to Roon and ask for their indulgence for a bit.