Most Nightfalls are pretty easy to solo. If not, then use LFG for Nightfalls and PoE. Regardless of whether you like PvP or not you have the option to get Etheric Light their too, you choosing not to is not Bungie's fault. There is also a chance of getting Etheric Light as rewards from Queen's Wrath and House of Judgement. Destiny is predominantly a co-op/group experience, as a 'solo player' you are either going to have to rely on matchmaking or LFG sites. If you are not interested in playing with others then you have no need for Etheric Light to get to level 34, as all of the end game activities are group activities. Either find some reliable friends to play with, or go play a single player game.