Returning to play prog server but what to do until then?

So I just resubbed yesterday. I do not have the last 2 expansions. I have a coercer that I boosted to 100 a 91 dirge 73 sk and a couple other lower level toons. I am coming back to play the new prog server, but what should I do in the meantime? I imagine when the new server opens Ill be there full time.

Is there anything that I can do on my other toons that will somehow benefit me? or should I just fool around? I plan on rolling a Templar on FG should I remake one now and play around with it some to relearn? Thanks for the advice and look forward to meeting people in game.