Offer me advice on how to get users?

So, I made an account here...I also just launched my app on Product Hunt. That is here: https://www.producthunt.com/posts/fast-flash-cards.

What should I do next? I'm just trying to see if people will sign up and use it. It's a free app. Next, I was going to post to some subreddits. Any thoughts? All I can think of is spamming social media.

Thanks.