hello who can help me.
I had a relatively rare user and I spent a relatively large amount of money on him but Facebook belonged to my mother and would mimic it Is there a way I can get my user back?
Monster Legends

I am not sure what you mean by losing your account but you can connect your game to the android, ios or windows 10 version and connect it to your Mother's facebook account, then once it is restored connect it to your windows, ios game center or google account depending on the platform you use. If your mother will not let you use her facebook to reattach your game then yes you have lost it.

My mom's Facebook account has been deleted and cannot be returned. Is there another way I can return the user?

Assuming you have access to original device you played on, you should be able to access the game and link to Google play to preserve game progress. Or you could request support relink it to a new fb account,

Edit: language

oh it's so sad to hear that you lost your account. I am new here and want to know all the terms and policies so that i can secure my new account. If someone can tell me or mention me in the terms and policy post then i will be thankful and can continue this apk game without any kind of problem. I hope this community will guide me.
Thanks.