In the past few months, I have been very aggressive with Facebook Ads. I use many channels to build my email list, but Facebook Ads is the primary source. I get people into my list by enrolling students for my free digital marketing course. I deliver the course via email, and that builds a rapport on a personal level.
Some of my students who like my teaching style enroll for my paid courses. These paid courses pay the bills for the Facebook Ads which advertise my free digital marketing course. I also pay other bills like web-hosting, email marketing, etc. with the revenue from paid courses. (If you have noticed, I do not have many ads on my blog).