There are private servers that try to be as close to Vanilla as possible, however that does mean that you have to put in the hours to get to level 60. Valkyrie is fairly populated. https://valkyrie-wow.org/
Thanks for the link. I dabbled with private servers a bit, but that was when BC came out and still retained some Vanilla feel. Might pop back on one now that Vanilla WoW is so long ago.
As someone who plays a lot on private servers, you might find the nostalgia goggles to be a little tinted if you try playing vanilla or even Burning Crusade. The game mechanics back then were just tremendously backwards to a degree anyone who has played more recent iterations of the game will be frustrated by, unless you really have some hardcore nostalgia going on.
