I find doing the quest to get Eriana's Vow Catalyst is a huge waste of time because even after all the strikes I've done even with the boosters I still have only 1% of progress and I'm well over 100 whatever season rank also. Bungie needs to increase the amount of progress earned exponentially or just make the catalyst drop from a nightfall which would preferably be better.
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It's meant to be a grind. Typically just finding a catalyst is a grind and then unlocking the catalyst is a grind. Maybe this game is too hard core for you? I got mine done a few weeks ago.