Where to put my (marketing) efforts to grow my company

I’ve started a supplements company with two friends of mine.
we have nothing to do with the physical product, we have all tasks (manufacturing, packaging, design, storage and shipping) executed by collaborations

We want to follow Brooke’s model of providing free content.
We want to regularly update blog entries on the website to provide value information about physical and mental health.
None of us have any desires to be on social media, nor shooting videos or making podcast.
Is that a mistake?

and are there other marketing channels that we are missing out on?

Apart from nursing organic growth, we also want to dive into the advertisement jungle of google and facebook.
should we consider other channels (e.g. LinkedIn? Local media, eg: news papers, magasines, bus ads, pinboard ads, billbaords ads, influencers)