Facebook accounts generally don't get 'hacked'.
Facebook accounts do get cloned, a copy of your original account for scamming your friends. This happens more frequently.
People who are hacked (someone is using your account), usually get the password, because you gave it to them due to a Phishing attempt.
Facebook gives you the opportunity to change your phone number and email address at any time. You didn't do that. They also have the opportunity for you to nominate 3 friends to hold certain keys, to help you recover the account. You didn't do that either. You could have written the password down, nope, didn't do that either. It seems that you failed at all the key places. Facebook the company are certainly not interested in helping you on a personal basis. They gave you all the steps to help yourself, but you took none of them. Keep trying known passwords. If you ever signed in on a computer, it may have remembered the password. There are also Password Revealer programs that store all your passwords. on a computer. I have one called 'PasswdFinder'. If you have an iPhone, they are all stored in 'Passwords'.
Try logging in with an alternate email
or phone number
You may be able to get back into your
Facebook account by
using an alternate
email or mobile phone number listed on your
account. If you don't know what alternate information you have: Go to
facebook.com/login/identify and follow the instructions.
How do I recover my account with verification of ... - Facebook
https://www.facebook.com > community > question > i...
So I was wondering if the fb team could let me have my old account if I could verify with the photos in the existing account and through some friends in the old ...
How can I contact the friends I've chosen as ... - Facebook
https://www.facebook.com > help
To get the recovery code from your Trusted Contacts: · Send your friend the link and ask them to open it. · Their link will have a login code. Ask them to give the login ...
How do I help my friend get back into their Facebook account ...
https://www.facebook.com > help
Visit the URL your friend gives you to access a special security code. · Give your friend the code, either over the phone or in person.