Been learning Kotlin for Android Development. What to do next?

Hello all! I'm going to start here with all the boring details, so if you want the tl;dr, skip to the end.
I live in the USA and only speak English. I've been hard at work studying Kotlin and learning Android development, because most of the threads I've read on here about money making include one thing - you must have a skill!

As I get deeper, im looking at the end game potentials of where this will lead me. Of course the ultimate goal is to develop my own apps for sale and/or publish free apps with ads. The end goal is always to be my own boss. But now the hard question.

How realistic is it, and how hard would it be to make a living wage developing my own apps? I want to make real apps, not just reskinned and spammy ones. Is this a realistic career choice? Would I be better off possibly doing freelance work, or getting certifications and working for a company?

Thank you in advance!

Learn Marketing.. how to sell your product (app, game, course)
by Marketing i mean SEO or App store optimisation.. google/facebook ads.. design..

for freelance.. as you live in US you won't have an advantage in term of price..

Learn how to marketing and hot to montize it.

The only way to figure out if your skill is worth is to start freelancing and start job hunt.