Blizzard has launched a free role transfer service in the designated 24 wow classic realms, which you can use to transfer characters from highly-populated, long queued wow classic realms.

 
 

Since there are no paid services in Classic to move characters between realms or factions, players were hesitant to roll on new realms announced after WoW Classic's launch, as they'd essentially be starting from scratch and losing their character's progress. With free character moves available, you will be able to continue playing your character, just on a new realm. There's still a fear, of course, that you'll move to a new realm which turns out to have a small population, leading your character to be stuck on an empty realm.
 
Transferring a character to a new server typically costs $25, so players who might wish to move to a server with smaller queues would currently have to choose between a fairly steep cost and starting a brand-new character if they wish to do so.
 
At the beginning of the free role transfer service, these new servers are only open to players who use free role transfer. Players with successful role transfer can create new roles on the new server. Blizzard will move gradually within 24 hours after the free role transfer service is turned on, in addition to the limitations of creating new roles in these servers. This is to give players who use free character transfer more chances to keep the name of the transferred character.
 
However, please note the following restrictions: Players in the above server can perform free role transfer on the character selection screen or the queue screen. Blizzard expects the free role transfer service to remain open this week. At peak times, free role transfers can take up to several hours to complete. If the transfer server reaches full capacity, the free role transfer service may be closed at any time. We strongly recommend that players who wish to use this service do so as soon as possible, especially those who wish to transfer with friends.
 
The following conditions will cause the role to fail to transfer:
1. The president of the guild.
2. Have an ongoing auction project.
3. There are messages in the mailbox.
4. You may be asked to change the role name after you arrive at the server.
5. If you already have a rival camp role on the PvP server you are transferring to, the transfer will not work.
6. This transfer is one-way and cannot be revoked. The customer service team will not be able to provide support for free role transfer.