i will not promote

Hey folks, I wanted to share some of my journey as a startup founder. We got into an accelerator program and got initial funding for an idea that we had. We had a solution-first approach, and launched the product when we felt it was ready. That's when the doubts came in. People surely reacted to our posts and shared them, but nobody actually signed up. We had to admit that we didn't previously know that one should start with customers, a mindset we have changed since. I just wanted to get a feeling, if there are people in this community who have been in a similar situation. You start with a solution, not the problem and not the customer. Then you realize the importance of the customers and start looking for them deliberately. Nowadays I spend my time on nothing but reaching out to people and talking to them to figure out what problems do they face. We also started using some tools to be more efficient at this. Anyone in a similar position? What approaches do you use to help you reach customers faster, or get more authentic leads?