Why am I not getting text from iOS users after switched to android?

Because they're sending you iMessages. And your Android phone doesn't speak iMessage. If you're going to keep using the Android phone, you should deregister from iMessage. This link will help you: If you can’t receive text messages from an iPhone - Apple Support

This is because your phone number is registered with Apple's iMessage servers. You would have to deregister your number:

Deregister iMessage on your iPhone or online - Apple Support

You must de-register iMessage.

Deregister iMessage on your iPhone or online - Apple Support

It sounds as if you may not have signed out of iMessage before switching phones. See this article for instructions on how to sign out now:

Deregister iMessage on your iPhone or online - Apple Support