How can I get back my murderer rank if I have changed my name

[FrostyTheG]

So I have recently changed my name and before that I had bought Murderer rank I think it was In summer of 2021 (or 2020). I just need to get my rank back cause I aint playing this game without my rank

 

[ShirakamiKazuo]

Requesting Thread Lock to prevent further grave-digging.
Flexier
Thank you.