We relied heavily on network effects early on starting with our friend group and encouraging word-of-mouth growth. We built a multiplatform app called dateit(https://dateit.com/), which is kind of like Facebook Events but with a better user experience.
Obviously, our product is very different from yours, but one thing that worked well for us was focusing on building momentum within small communities first rather than trying to appeal to everyone immediately. Tight-knit groups tend to generate stronger early engagement, which can give you the traction (and feedback) you need to grow.
Another thing we learned: making it dead simple for users to share made a big difference. Even small friction points kill word-of-mouth, so optimizing for effortless sharing really amplified our reach. In your case remove as much friction as possible whatever that is.