If 2-3 represents all of them then I would just put in conversation with them that you'd appreciate any referrals they can make and if you think it would help offer them some financial benefit for it (the amount is culture dependent, I find).
If you exhaust them and the rest of your professional network, try local industry meetups (especially industries that you have made sites for before).
If all else fails then try your luck in the forums and job boards. I suggest taking on small stuff to get your foot in the door and aggressively vetting the personal and business characteristics of new clients for this way.
I'm back to full time employment though so make of that what you will!
I'm also at full time employment but I miss the autonomy and working from home.