Hello Advesh!

Social traffic from acceptable sources like from WhatsApp, Facebook, Instagram, Telegram, Messenger, YouTube channel pages, Google, Yahoo, Bing ; but not other external sites. Your channel must have an external source percentage of below 20% so that youtube can percieve the views you are getting as original views. So you must not always share your links to other external sites much, that's it!.

There are different websites from where you video is viewed. If that is from a server or any kind of subs for subs app or view for view app then your channel will be rejected for monetization.

Hope this answer helps:)