Build Fails After Upgrading React Native from 0.67.3 to 0.75.4 - Gradle and SDK Issues

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It seems like the react.gradle file is missing from node_modules/react-native .

Maybe you missed some upgrade step you should have taken?
You probably should ask R/N maintainers or community, not Gradle community.

Even though I’ve set compileSdkVersion = 33 in my build.gradle file, the error suggests that it’s not specified.

You set a (bad practice) ext property with that name.
But the Android Gradle Plugin complains that you do not configure that property in its extension, those are two completely separate things.

Do I need to update the Gradle version, Kotlin version, or SDK versions to fix these issues?
How do I resolve the missing react.gradle file?
Is there any additional configuration required after upgrading React Native to version 0.75.4?

You should really ask R/N people how to properly use R/N, this is not too much Gradle related.