It's easy from Websitetoapk.
Just download the software from here, https://websitetoapk.com/download.html

Install the software.
Run the software and fill in the details as per required, then you can create the apk file for your app.

You probably need a .aab file to keep your app in the Google play store which requires to be purchased. The free version only allows you generate apk file to test it out.