How do you market your app

What up fam. I recently built an app. It was not to make any money, more just an exercise to gain experience in building a mobile app and learning how to push to the iOS app store before building something more complex. Mission accomplished. Now I am sad because it has not gotten any downloads. Not saying I think the app deserves to go viral, but I would like to see at least a few downloads.

This has me thinking. Why waste my time building something more sophisticated if I do not know how to market my app and get downloads? In my past life as an engineer, I would build products and the business would handle the rest. But now I would like to learn how to do this.

As a challenge to myself, I would like to see how may downloads I can get on a budget. But I am not sure where to start. I know of google and facebook Ads, ASO, etc. but I have never directly used these. What is a good budget to start with? What beginner mistakes to avoid? What Keywords to use? I will be using my own personal cash so I am trying to minimize mistakes.

The app itself helps match homeowners with home professionals.