Help me pls

Today i got new phone and i tried to login into my account but it asks me verify from my long lost gmail account it never appears before i didn’t turn on the secondary password or new device I don’t know what to do i’m so confused and i asked CS to help me but it didn’t help me i don’t know the accurate dates i have put lot of efforts to that account so please help me mods i hope you guys will help 🥹