Demian Farnworth defines content marketing strategy as this:
A content marketing strategy is a plan for building an audience by publishing, maintaining, and spreading frequent and consistent content that educates, entertains, or inspires to turn strangers into fans and fans into customers.
Start small but start with a strategy. Make goals. Document your plan. It’s the only way to later know if it’s effective.
How do you know if your writing is effective with your readers?
Do they share/forward/post it?
Do they provide comments?
Are they actively following you and enjoying your content?
Track these items. But most importantly, have it as professional as possible, which includes a copyeditor/proofreader. Make certain to write well or get help with it before publication or uploading.