@isle9 is right that it is just easiest to create a new account to achieve this. There is no easy method of cleaning up an existing workspace, and while you can use sets to get most of it gone, certain things can sometimes remain and it can be problematic. Check out this topic if you would like to keep your current account and try to remove everything:
Before opening a request… this feature is marked as Implemented, is it wrong?
I can’t delete/recreate account. I can, but I have to ask the storage extension each time (when I’m already waiting for it to be done for this new account), I risk saturating the support .
I’ll see about creating a “trash” test account, but I don’t think you can choose an account when you launch Anytype. I’ll look into it (unless you’ve already got some tips for that?).
I’m sure they will be fine with a few extra emails. Also, you can ask for extra storage only when you settle in on an account, and that way you’ll only need to ask once.