Neverland Casino - Level 300 for 2400 SB

Is anyone doing this offer with the Double SB bonus from AdGem? I started on Thursday and I'm only on level 215. Unlike other casino games, which seem to give you big wins every now and then, this game is super stingy and there don't seem to be many free coin links like Pop Slots and Huuuge Casino.

I've researched some of the older posts on Neverland, and people say to play the Journey feature to get double XP, but i haven't been able to get lucky and get that. How are people completing this offer within the 12 day time limit?