Your blog will become successful only when you have visitors. How do you attract visitors? If your blog is optimized for search engines you can get traffic but if your post does not meet reading standard of the visitor, he will leave and you might not make money. Therefore, the best approach is you need to create a balance between content that is liked by Google and content that is liked by human readers. For instance, if you have 30 articles, you can have 15 articles for search engines and 15 articles for human readers. When your posts rank high on search engines, traffic will come. If your article are also written for readers, your visitors will find interesting, and they will engage with ads and you make money.