My original College email used as registration is defunct - can not access my zotero account
I created my Zotero account during my masters' studies at the now defunct Goddard College of Plainfield Vermont, using my @goddard.edu email address. Now, when I try to access that body of information which I saved to Zotero, my old credentials no longer work, and Dashlane, my password keeper informs me that the old password was compromised. The @goddard.edu email was part of Goddard's Google academic account serving the entire college community and it was brought down after the college closed, so I can not receive a password reset link there. Any ideas on how I can regain access to my zotero research with my current personal email address?
Upgrade Storage
Because if you can access your settings here, you can just add a new email address and make it primary.
If this isn't the right account and you can't login or receive email to your old account, email support@zotero.org with details & verifying information.
(FWIW, I'm not aware of, nor able to find anything about, any security breach at Zotero, so that message from Dashlane is odd -- I have multiple Zotero accounts saved in Dashlane and have never heard of it)
If your storage is at 300.5MB it just means it's full -- your library could have been multiple times that times -- files above 300MB simply wouldn't have synced, but importantly, metadata (i.e. the actual item information) should have synced.
I'm trying to understand this part "when I try to access that body of information which I saved to Zotero, my old credentials no longer work" -- how/where are you trying to access that information? Do you just mean in the web library here? If so, and you don't see it with this account, I'm not sure it was ever on the server. Zotero is principally a local app and you can use it effectively without syncing or with a sync that's no longer working, which would mean items were only stored on your local computer.