serious question for founders who have real paying customers. I don't want advice like : post on linkedin do DMs do emails Because none of them works at early stage. It's too hard to get your first paying customer. And I really want to know what worked for you? And if emails worked for me then how did you get those mails? Did they really answer your mails? After deploying, when did you get your first customer? How did you define what acquisition channel works for you? An...