Assuming that all PVP issues exist and would be resolved by balancing numbers of players on either faction, per server, a player-lead initiative that may be helpful, somewhat thematic for Alliance (maybe), and even community-fostering (something, I believe at least a portion of the WoW Classic community cares about), could look something like this:
Someone active on the forums, and on a server with high faction disparity becomes a Balance Movement Ambassador.
Duties of a Balance Movement Ambassador
Reach out to guilds on your server to:
- compile lists of recruitment needs
- gather starting resources (silver, bags, etc.)
- coordinate leveling parties (days/times/groups/escorts)
- liaise with BMAs from other servers to coordinate social PR and recruitment efforts
- recruit and delegate tasks to Assistant BMAs
Some food for thought.