There is a discord server: Ars Magica Discord Server
Did you see the fora for play by post on this server? They are worth a try, even if adverts, from both players and troupes with openings, are more frequent on the discord server.
And TBH, the traffic here is not so overwhelming that I think anybody would mind if you tell us what you are looking for 
Voice or PbP for instance? Time zone?
Unfortunately, my sagas are full at the moment, so this is all the help I can give. Hopefully there are others.