2 things you should work on to make your content more search engine friendly to get better search engine optimization (SEO) result
1) Relevancy in Contents
Search engine looks for relevancy in contents at your blog.
So you should maintain relevancy at your blog, means your blog post should be somehow relevant (related or same in nature) to each other.
For example if your blog is about cricket game, then your blog post should focus on cricket bat, cricket ground, cricket lessons etc. Topics other than cricket wouldn't work fine for better search engine optimization.
To improve relevancy in contents you should focus on keywords sincerely to get better idea in content creation.
2) Original creation
Maintain originality (uniqueness) in your content.
It is practically proved that same piece of contents around web wouldn't rank high in search engine result because search engine love your unique creation and not that copy paste work.
If you don't have enough time to improve seo still you can improve search engine ranking by focusing on these two factors of content.