RIP you.
Narumea is great, it's just that dark life is tough life. Building up a dark attack weapon pool is, for lack of a better term, terribadly crap at the start. It's a long, long, long road and you'll see people that started in the main 4 elements, fire/water/earth/wind, to progress a lot faster because of the drop tables favoring those elements. Mostly wind, less so earth. D
So you can stick with it, it'll be painful, slow road. Or, consider dark as a side project as you work on another element, if we run into a drought of dark events in the future. It's a little unfortunate that you started now and missed the Slayers Magna and most of the crab event, those would have boosted your weapon pool into respectable levels.
While it feels like I'm totally shitting on dark, it's only for the early to mid game start. Once you build them up, they're strong. Just getting there will take, on 'average', 3x longer then the main 4-elements. There are, however, a few little things in dark that will force you to take a bit longer then even that.
Dark lyfe, tough lyfe.