Though I appreciate and need reminders that writing is the most important thing, I should clarify that my own social media presence is not the result of pressure to sell books. I'm just a full-time internet. I have been since I was eleven or twelve. Don't know any other way to live.
I mean, I do fantasize about being less easily distracted and more able to focus on writing for hours a day. But I also spend a lot of time working at home alone (or parenting at home, which is not being alone, but at this stage there's not much conversation happening), so checking social media is really a way to have a little bit of human interaction and feel less lonely.
I'm wary of demonizing all social media, or all screen time, when really it provides a lot of good.