You need to understand that today there are roughly millions of articles, blogs, and web copies already published for content marketing. Many online writers have already written about information that you are thinking about writing.
Checkout the plagiarism level via a tool. It is best to use a premium level tool and see if the content is around 80% to 85% unique and has a rate of 15% plagiarism. Lower than 70% uniqueness can be troubling. So, try and rephrase some words but to not make things too much complicated.
In best case scenario, try to choose topics that are unique, it all depends on your creativity level. Good luck!