If you write loads of content and looking to market it now here is free tool by Neil Patel, it's called Ubersuggest, it's a free keyword suggestion tool. Since Google has stopped free keyword planner, marketer were in dying need to get a free tool that can help in content marketing. Keywords are like sales person, better sales person make bigger sales. Neil Patel is awesome with content marketing. He create minimum viable products and leaves it in users' hands for testing. If you are a digital marketer Ubersuggest is worth trying.