Not really, that's what I did until I got enough currency for the Shop CEs. After you get all 5, work your way up one of the point ladders to 100k so you get your (unless you're very lucky) first Wolves of Mibu CE. That's probably the end of necessary farming until next week, just hit best nodes with natural AP than; The goal I feel is to try to have a team that can handle those nodes simply enough with 5 Fortress/1 Wolves CE.