There are two options:
1) You may login to your old university account, and simply change the email adresse. However, there can only be one Account per email address, so you'll have to delete the new account or switch it to another email addresse in advance.
2) You can login to your old university account, go to each project's project settings, and grant your new account access.
Please understand that we do not simply change project owership on request, because that would be a significant vulnerability to social engineering attacks.