Yes, GitHub support is pretty bad. I have an alt account that I want to log into that I can't remember the exact <myemail>+<suffix>@gmail.com I used to register

Yes, GitHub support is pretty bad. I have an alt account that I want to log into that I can't remember the exact <myemail>+<suffix>@gmail.com I used to register the account. They won't tell me what the email address is, I can't prove to them I made the commits on the account, no matter how much information I give them. The only recourse I have is to wait a certain number of years when GitHub classifies the account as dormant and then I can request the account be reclaimed due to it having the username I prefer (my name). I completely understand the security reasons for not leaking any information such as the email address but come on, I already know the password to the email if I could send a password reset and every other related piece of info, etc. They won't even send a password reset on my behalf. All I ask for is the email address. I didn't activate any advanced security features like 2FA on the account. In addition, they take around a week or more to respond to the contact form, so disregarding my specific situation entirely, their response time is a bit meh