I Need a Simple VPN App Development for Only Android at Budget Price

Hello mates,
I am Sourav.

I Need a Simple VPN App Development for Only Android at Budget Price.

VPN App Requirements:
1. VPN App Development Only for Android
2. Only OpenVPN Protocol Support
3. Admin Panel for Only Manage Server
4. In App Purchase & Admob Ads Implementation
5. Native(Java/Kotlin) or Cross Platform like Flutter Accepted
6. My Budget for this App is, 50$

Note: UI design will be simple/minimal & similar like this app:
https://play.google.com/store/apps/details?id=com.martha.gamer.vpn.freefire

I am looking for a developer for multiple/different VPN app development work at regular basic. So, I always need most affordable pricing.

Regards