Forgot Apple ID password

Hello

really need some help

please .

I had my old iPhone 7 reset by someone to use for my daughter (Xmas present )

went to set it up last night as says locked to owner

I am the owner , had from new .

but do not use this email /Apple ID any more & I can’t remember the password .

what can I do ?

thank you in advance

[Re-Titled by Moderator]