Just move your Main to a more populated server (after doing some research / creating a level 1 toon on a few servers first) so that it doesn’t end up costing you too much.
Alts are exactly that, alt(ernative) characters. After your Main is settled, save up the gold for tokens and move your primary alts over. Token cost is at an all time low right now!
I know all about shifting toons over, having changed from a medium to a higher pop server with my Main and 6-7 alts, after my old guild wasn’t able to recruit raiders on our old realm and shifted servers. I was one of a few that did this while many just moved their Main and rolled new alts.