1) I use a personal DB account linked to my old (non-gmail) email address. However, that email address is no longer valid or functional. All my files are in this account and I use it daily.
2) I used to use a DB account linked to my gmail address. I stopped using that account long ago because it was full, I didn't want to upgrade, and I think I didn't even remember I had it when I set up my current DB account.
3) I need to change my current DB account so that it is no longer linked to my old (non-gmail) address that is no longer functional, so that it will now be linked to my gmail address. I realize that probably means wiping out that old account - and that's fine.
4) whatever I do, I DONT want to lose whats in my active DB account.