First Try – Clear Cache with npx react-native — –clear-cache
Second Try – Clear Gradlew – cd android and then ./gradlew clean
Third Try – Try Browser Debugging with https://reactnative.dev/docs/debugging
Fourth Try – (If the project is not working at all) – Run Doctor with npx @react-native-community/cli doctor
Fifth Try – Remove node_modules and install again with npm install
Sixth Try – Rush to Google / Stackoverflow