How to merge with lost account?

I was trying to send a score to YouTube, but my channel is currently connected to an account I can't log in to because it used my school google account, and my school district does not allow logging in with that account for any non-school services since a little bit after I created the account. Since the account has no password and I can't log in to it via google to add a password, I also am unable to merge the account with this one. Is there any other way to merge them or get the channel off my lost account? The lost account is cartermosoff btw