Angular main.js file large size

My project user angular version 7, and here is the angular.json configuration

when I build for production my main.js file is way too large nearly 12MB in size which makes my app to load the page very slowly. Nearly the initial load tooks 4 - 5 minutes

Here is the build result

Here is my analyser result

Thanks in advance

Split the file which is taking too much into modules and apply lazy loading