Its no coincidence that the world number 1 pre seed and seed accelerators are creating content and you should too. This is because they want to become an ed tech business as well as a VC. Its clear and you should start asap if your building your own business!
Podcasts, talk shows
They know there space well, have tons of experience in building a business and want to show everyone how to do it. This is the best way of getting out there. They have become a bit of a ed tech business as well as an investor. There content is good and interesting and teaches people how to build a business from the ground up.
If you do know or have an expertise on something you should do the same thing!
The best lesson from all of this is clear. You should start building content around the product or service that you are the expert in. You will amase the audience and start the build a community and can then sell out anything you wish.
The cheapest way is get yourself a medium blog and start writing around the topic you are tying to sell. Dont sell directly to the audience but teach them about the space.