Have 2 alts level 40. Not too interested in raising light level (got them full legendary gear at around 310), but I want to fully level their subclasses as fast as possible (it takes so unbelievably long, and just doing endless crucible is soul-crushingly boring). I currently have Voidwalker and Striker fully levelled, with Sunsinger and Defender in progress. Have zero progression in Stormcaller and Sunbreaker aside from the quests in which you obtain them. Sungsinger is almost halfway done. Defender is about a sixth done. I need to grind XP faster so I can max these subclasses. I've tried doing strikes, crucible, bounties, patrol, but it's still agonizingly slow. What is the fastest way?