Seeking guidance on cold starts for my new website

I recently embarked on a whirlwind journey of entrepreneurship that I'd love to share with you. Just last month, fueled by a surge of inspiration (and a lot of coffee!), I managed to build a website from scratch in just three days. It's a platform called https://heymusic.ai/, an AI-powered tool designed to help creators produce music with just a few clicks. Now, as I stare at my live website, I'm grappling with what feels like a bigger challenge than the build itself: the cold start. How do I introduce HeyMusic.ai to the world? How do I reach my target audience of budding musicians, hobbyists, and content creators who could benefit from this tool? I’ve read about strategies ranging from content marketing and social media blasts to collaborations and influencer partnerships, but it’s tough to know where to begin or what would be most effective for a niche product like mine.