How could I transfer my character from one private server to another?

I, I have two very important characters for me in a private server called firestorm, and due to the huge number of bugs that I had decided to change to this one. Would there be any way to transfer those characters here? One is a blood elf witch called MissDjsamba level 70 * and another is a blood elf level 101* demon hunter. cfthm1cfthm1cfthml

there is no such possibility.

there is no transfer between servers