Running out of leads on Propstream

[Austin Bright]

Hi 

I am an investor in Dallas, Texas. I've been pulling vacant lots and SFHs from propstream for 8 months and texting them. 8 months and 100,000+ addresses later, I have difficulty find new addresses that I haven't pulled before. My criteria is already very wide (build,sqft, # of bds, occupied (Y/N), price. I've done it all), because I focus on volume (15-20K leads pulled per month) to get cost per lead low. 

Is it time to cancel and go to any lead source such as batchleads? Will I just encounter the same issue? How have you handled this issue?