How do I get more downloads on a new app?

So we recently launched this app that's a digital journaling app for iPad and iPhones. The app is currently in full production state and has a good amount of features so it's definitely not a half-baked product. But I am finding it difficult to get more organic engagement. I know I can run ads but the app is fairly new and we are low on budget. What all I can do to get the word out there on a lower budget? PS. We also have an Instagram page but the followers are too low so there's no social media engagement as of now.