Property Acquisition Methods 200K or less with 30% profit

I have been trying several different methods of acquiring properties in Myrtle Beach, SC but nothing is really bringing in deals at a consistent pace. I have tried lists from REWW / Realeflow / Datazapp to try and contact motivated sellers, but the vast majority of these prospects have no interest in selling their property or want too much. I've driven communities looking for vacant properties, and I also have a bandit sign campaign going, which seems to work the best so far. Has anyone found a method of acquisitions that yielded consistent results? (my mail campaign has been going for about 3 months now and I've sent out approximately 5 to 6,000 letters in total with minimal results. Any actual testimonies that aren't paid ads would be awesome! Thank you in advance!