Facebook Account Hacked & Username Changed: Recover Old ID and Free Fire

I am writing about my old Facebook account, which was hacked about four years ago and has been inaccessible to me since then. After it was hacked, the username and profile link were changed, and now I cannot find the account at all when I search for it. That Facebook account was registered with the phone number 01408124***. The same Facebook account was also linked to my Free Fire game account with UID 1607459714. Because I lost access to the Facebook ID, I also lost control over the linked game account and all my progress there. I have not been able to recover the account on my own and I have not yet received any help from support channels. I kindly request that my identity and ownership of this account be checked and that my old Facebook ID be recovered for me, or at least that I be given a clear solution so that I can regain access to both my Facebook and the linked Free Fire account.