Have you tried google app beta test program but all of them are filled then you how to apply a google app beta tester. I explain how to apply your google beta tester program if that app full.
Open your browser paste this link and change the last app is to your beta app id then you see your app Beta program application.
Exact link like this:
https://play.google.com/apps/testing/com.whatsapp
https://play.google.com/apps/testing/for-your-app
Click Yes and enter password now you eligible for app beta test program.
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