Recovering my HN account from FOSS Materialistic app?

Hello there, HN, I need your help. I registered and only ever accessed this account using the Materialistic app from F-Droid, but don't remember my account details. The app seems to be discontinuedas there have been no updates since 2019, but still works fine. Could anyone help me? If needed, I can post some contact info of mine here, since I don't even remember which e-mail I used (pretty sure it was my old spam gmail account)

source: https://github.com/hidroh/materialistic

screenshot of me signed in: https://i.imgur.com/ZlyIyqh.jpg