I accidentally deleted an app on my iPhone and I can't find it?

I was getting rid of a lot of apps and accidentally deleted my VPN ad blocker and now I can't find find it in the App Store. I tried searching for it in both the search bar and in the purchased section but I've had no luck. And all the other VPN apps fail in comparison.

Restore it from a previous backup.

Possible it is no longer available in the app store.

No guarantee the app is still in the appstore. I've written many apps, and over time I've taken some down for various reasons, I'm sure others do it too.

Apps are frequently removed from the App Store. It happens a lot. Sorry.