@doell, You are very lucky to turn 8$ to 400$ although the wagering is very high, I think you can make it because  already have enough bankroll now to complete the wager before you bust. Just play slots with high RTP and Hit ratio even though the ROI per spin is low. What slot do you play to get that 400$? I assume you hit multiple bonus during your free spin session ang gives you a huge multiplier.

Update is if you manage to withdraw. Just take your time and play slowly bro!