Earlier today Gehennas (EU) moved from High to Full and Blizzard advised players to avoid all Full servers, as they will have very long queue times.
New NA Realms
Blizzard
August 26, 2019 10:00 AM , we will remove the limitation on only creating a total of three WoW Classic characters per WoW account.
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Source: More New Classic WoW Realms Coming August 26th (https://www.wowhead.com/news=294640/more-new-classic-wow-realms-coming-august-26th)