giving talks and more talks and more talks at MeetUps and similar events. Or organize your own. Then underpromise and overfullfill. Use then these contacts f

giving talks and more talks and more talks at MeetUps and similar events. Or organize your own. Then underpromise and overfullfill. Use then these contacts for a) more talks b) new clients repeat. Also set up a newsletter / mailing list. Start collecting emailadresses immediately.