I understand you exactly. In the first weeks of working online, I also had problems concentrating. It was just that there were a lot of things distracting me, not only social media but just being at home inspired me more to do housework rather than work.
I think it’s good to set boundaries. The family is also supposed to know that you are working during the given hours and you are “unavailable” at that time.
As to talk about my experience, I set such boundaries with my son. In addition, I logged out of all social media accounts on the computer, and I keep on leaving the phone in the bathroom so that I would not be tempted.
I also stopped buying sweet snacks and set exact times to eat meals. What I have in unlimited quantities is access to water.
It happens that I sometimes miss people. Fortunately, I work in a fantastic team like Mudita, and in moments of “loneliness”, we video call each other. But not only. I take my dog for an hour walk at least once a day. At that time I make sure go to places where I will definitely see other people.
Putting your thoughts on paper is also a fantastic idea. So I think if writing a blog helps you, just keep doing it.
I wish you all the best and good luck in creating your perfect place to wor!. I also keep my fingers crossed for the decision to ditch your smartphone in favor of a simple device. I would love to read soon how you are doing.