I think you need to play slots more so you can hit multiplier bigger than 1000x, or maybe you chose the wrong slot which is hard to give big multiplier.
However if talking about experience at Shuffle, I have not hit big multiplier in both slot and plinko since my activities here is not much to be honest.
Tried to beat the available challenges at Stake with few deposits but still not luck so far.
I think it is better to wager in order to unlock SHFL now while waiting for the 2nd Aridrop.