How tf do you manage screen sizes in mobile game development these days?

@Jilano that second idea is great. Should i do this exclusive next to the ad-free version for 1.43 USD?

Well first you ditch native and use some web framework so you can use JavaScript and HTML. You never learned about CSS media queries so you import bootstrap, angular, jQuery, react, three.js, and write a whole separate backend using NodeJS, PHP, Java, python, and ruby.

Since the application takes up 3.5terabytes of ram, resolution is the least of your worries. Ta-da.