talk to yahoo about it
Do you know how to do that? The only direct contact I see is a scammy paid phoneline
Account recovery - https://edit.yahoo.com/mforgot?intl=us&l...
Accounts are closed permanently by Yahoo if not used for 12 months.
This is how to recover your account if you have password/sign in problems: https://help.yahoo.com/kb/SLN2824.html