SDK location not found on Mac?

I'm trying to run my React-native app "Android" but in every single time before i add the SDK path inside project files manually like this

local.properties

sdk.dir=/Users/USERNAME/Library/Android/sdk

RN Error

• What went wrong: A problem occurred configuring project ':app'.

  SDK location not found. Define location with an ANDROID_SDK_ROOT environment variable or by setting the sdk.dir path in your project's local properties file at '/Volumes/..../.../.../.../android/local.properties'.

but that's tired if i want to do it in every single project i work for it

I'm Seen these answers but no one works for me

and here my .bash_profile =>nano ~/.bash_profile

So What's Wrong I made?