You simply need more referrals:

Level 1 (Your friends):   1313
Level 2 (Friends of your friends):   4226
Level 3 (Friends of Level 2):   7256
Level 4 (Friends of Level 3):   7132
Level 5 (Friends of Level 4):   5012
Level 6 (Friends of Level 5):   2034
Level 7 (Friends of Level 6):   721

I have withdrawn many, many times 

I did start the referral train in this thread, and did a bit of promoting...