If you want to get the approval of Google AdSense Then you have to follow these steps.

You should always publish unique valuable articles on your blog website.  

Publish minimum of 20+ articles in your blog. 

Wait for one month after creating a new site.  

Don't stop posting fresh unique articles to your website after applying for Google AdSense.

Never publish any illegal things to your blog site or link to any site which is doing illegal activities. 

Make your site's navigation system very easy to understand and user friendly.

Use Amp for your blog site.

Do publish valuable and unique content which really helps users. 

These are all the things that if you follow then your site will get Google AdSense approval guaranteed.