unable to reduce react-native application's size - react-native

Question

i made an app with expo but am not satisfied with it's size, i found this blog/tutoriel on how to reduce it using react-native init project , here is the link : https://medium.com/#aswinmohanme/how-i-reduced-the-size-of-my-react-native-app-by-86-27be72bba640
the blog says to "Install all dependencies of the Expo project except Expo specific libraries." , but since i made the app with expo i used expo-av and expo-linear-gradient,it gave me this error
error: bundling failed: Error: Unable to resolve module #unimodules/core from
node_modules/expo-av/build/ExponentAV.js`: #unimodules/core could not be found within the project.
this error was fixed after i downloaded expo into the directory, it gave me a white screen but the build was succesfull.
when i removed the expo related libaries, it gave an error (ofcourse..).
NOTE : this isn't the first time that android studio emulator gives the white screen :( , so what am i doing wrong !!
here is the current package.json , i didn't change anything else in the project directory exept from adding the js files and the assets folder.
{
"name": "fixemulatorBug",
"version": "0.0.1",
"private": true,
"scripts": {
"android": "react-native run-android",
"ios": "react-native run-ios",
"start": "react-native start",
"test": "jest",
"lint": "eslint ."
},
"dependencies": {
"expo-av": "5.0.2",
"expo-linear-gradient": "~5.0.1",
"react": "16.9.0",
"react-dom": "16.8.3",
"react-native": "0.61.3",
"react-native-drawer": "2.2.2",
"react-native-elements": "1.2.1",
"react-native-gesture-handler": "^1.5.0",
"react-native-reanimated": "^1.4.0",
"react-native-vector-icons": "^6.6.0",
"react-native-web": "0.11.7",
"react-navigation": "4.0.10",
"react-navigation-drawer": "2.2.2",
"react-navigation-stack": "^1.9.4"
},
"devDependencies": {
"#babel/core": "^7.6.4",
"#babel/runtime": "^7.6.3",
"#react-native-community/eslint-config": "^0.0.5",
"babel-jest": "^24.9.0",
"eslint": "^6.6.0",
"jest": "^24.9.0",
"metro-react-native-babel-preset": "^0.57.0",
"react-test-renderer": "16.9.0"
},
"jest": {
"preset": "react-native"
}
}