Okay - do I do that via bounties, etc? I've been playing for quite sometime (mix of story and multiplayer) but the upgrading of both of those subclasses barely moves. :\ Sheesh how did I get this far and not find a way to upgrade this stuff? Ugh. tw

Anything you do will increase the XP for those subclasses. Bounties, quests, crucible, strikes, etc. It takes a VERY long time to fully upgrade a subclass.