Honestly, one of the smartest moves you can make when launching something new is leaning into UGC. People naturally trust a service that someone else has already tested and vouched for. It's like walking past a busy restaurant versus an empty one-social proof does the heavy lifting for you.
Since you're specifically looking for content creators, I'd focus on finding a few who genuinely vibe with your app and giving them early access or a small incentive. Their organic posts will feel way more authentic than any polished ad you could run. Just make sure the creators align with your brand values, or the crowd you attract won't stick around.