I've been working on a side project for around a year now that is basically done (or at least good enough to launch, I hope). It's a website / app that lets you find people like you, near you. Basically, you swipe on concepts (dogs, books, vaccines, etc.) instead of people and then you can find other similar people near you. You can also identify with whatever interests you'd like and then find others with matching interests. Here's a link: https://www.kardius.com
I posted it on a couple subreddits and got a lot of really good feedback along with around 300 sign-ups. People seem to like the concept (which is great!), but unfortunately, the value of sites like these are often directly related to how many people there are on the platform. Most people find there is hardly anyone to talk to, very few posts, and as a result, there isn't really anything much else to do after swiping the cards. As a result they get bored and leave.
I've been entirely a developer up until now, and I know next to nothing about marketing. I was wondering if IndieHackers might have some ideas for how I could grow the site? I'm really wary of trying to link it elsewhere because there is a stigma against self-promotion most places online.
Also, if anyone has other ideas for any improvements I could make to the site or things I could make more clear, I'm all ears for that as well. I originally created this because I personally desired the functionality that it exposes, but now I'm not sure how to actually make it useful by having enough users to where there's a point to log in and engage with the site's features.
Thanks for reading.