How to Find My First Clients as a No-Code Agency (NEED HELP)

I need help finding my first clients, but I'm not sure how to begin. To give you some background, I have five years of experience as a product manager building digital products, and I am looking to start my own agency. My goal is to help companies scale by using no-code tools to create customizable solutions that support their operations.

The challenge I'm facing is that I have no marketing experience. I've already tried reaching out to my network and friends, but so far, I haven't had any success. Where should I start?