Yeah, it is a twofold task really: 1) devise & ship something that makes sense and actually adds some value somewhere for a good number of people; 2) put it in

Yeah, it is a twofold task really: 1) devise & ship something that makes sense and actually adds some value somewhere for a good number of people; 2) put it in front of the target niche through the cheapest feasible means of any type, aka do not get into the social media marketing rat trap. In my very limited recent case, I produced a Kindle booklets series earlier this year (20 academic literature reviews) and started selling some through targeted ads on Amazon.com, at $0.03 per click, on top of a very few thousand visualizations per day. Ramen profitable, but a platform to start from for small incremental updates in the mid- to long- term, hopefully.