I’m launching my SaaS soon, and throughout the build I’ve kept moving between believing strongly in the idea, doubting it, then believing in it again. I haven’t had the chance to validate it properly through real users yet, although I’m hoping that will come once I launch. For those further ahead, what was the first genuine sign that made you think your product was worth continuing with? Was it your first paying customer, good feedback, genuinely believing in your idea and the problem it s...