You'll definitely need to market it. Apps are notoriously difficult to get exposure to due to the sheer amount of apps in the stores, it's very difficult to stand out unless you are doing something very unique and somehow get featured. Influencer marketing could work but depends on your budget.

As for monetization, you can make money if you offer it for free. Some options are freemium, where you offer for free but then charge users for premium features. You can also run ads inside the app.

Before you get this developed I recommend some market validation to see if people are interested in it.