Thread: need advice for long term strategy

hey there i usually read this forum but rarely post; now i'm at a point on aigis i dont really know what is better to do next, i can usually do event without a lot of problems, only having problem with the story map (stuck at the danger in the oasis).
I'm current lv 177 with around 1 million gold and 260 demon crystal, the point i dont know wich unit i should aw next, what my team really need to improve(aside from reduce cost), i cashed in the past but dont plan to cash in the future( 2 time 150 sc with only 3 plat in total...)
Thx all your your advice