How can I be whitelisted to a server? My acc was stolen and they used it to cheat, so after noticing i was banned by every server i understood there was a leak on my acc and recovered it and changed pass etc etc... admin said i can be whitelisted by single admins on each server, how is it possible and how can i do it? 

By reaching out server admins and asking them to whitelist you manually on their servers. Now how you find them is another thing, most servers have discords and put the link in the description 

thank you mate, i'll try that.