Hello!
I changed host for my server.
I had to name the new server like the old one for ip requewst on server comunity and after that i intented to move the old from the old statistic to the new one.
But the old server is gone.
I can't find it to make the trasnfer. what happened???
A 3 year old statistic is gone.
What can be done?

nothing can be done to restore deleted statistics . I am afraid to say but you would need to stay like this and in future I will just suggest you to just change the DNS A record IP Address from DNS Panel , changing / replacing from OLD-IP to > NEW-IP . This way you just change the whole page with your player stats including your rank.