You need to make sure that your site:
1- Has enough content; full, unique, relevant and very helpful articles and posts for the readers
2- Doesn't have any copyright misuse; like copies of: posts, videos, photos ...etc
3- Doesn't have any affiliate links
4- Doesn't have any allocated paid traffic source and you must get organic traffic "Visitors"
5- these are the most important tips and other factors would be determined by the Google company itself
I hope that I helped you
For Your Success,