Well that sucks for you. The only thing you can do right now is to try and play when the pvp server have as little players as possible online.
A solution is on the way in form of a cluster project:
https://forum.nostalrius.org/viewtopic.php?f=2&t=35310No release date is set for that yet.
Also when the TBC realm is released there will probably be less players online on the vanilla realm. Or not, I don't know but it would be logical.
Nostalrius have clearly stated that there is no plans on banning any nationality or client (so people don't have to make any more bullshit posts about banning "Chinamen") or open more pvp realms at this time.