Transfer bibliography from one account to another /combine two accounts

I have the following problem: I registered on Zotero with two different email addresses (I forgot that I already had an account). I've been using the second account only until I reached the free data limit. Then, I clicked on the link to upgrade my storage and by mistake, logged in with the wrong email address (of my first account) and upgraded the storage. So now I have accidentally upgraded the account that I haven't been using at all. Is there any possibility to combine both accounts or to transfer the whole bibliography from one to another? Or does anyone have any other idea how to deal with this?
Thanks in advance!
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