How many platforms do you use to market yourself and your work?

As I continue to post on dev.to, I consistently see post after post telling me to never stick to one site, one platform to publish my articles to. Whether it be hashnode, Medium, or any other dev website, we are encouraged to broaden our scope to reach a wider audience. But how many is enough? And how many is too many?

Where else do you post? Do you count Instagram and Twitter? Or do you only stick to one platform? And why?