This person is using social media as a tool for self-development and improving their mental health. The way to work on anxiety is to learn to focus on, recognize and ultimately let go of idle thoughts.

Your solution may be healthy for someone who is experiencing burnout or whose anxiety stems from internet overload. Certainly taking time away from these things and living a simple and focused life helped me for several years. Given OP's level of anxiety in the face of the mundane, I suspect this advice taken in isolation would be insufficient at best and damaging at worst. A habit of avoiding idle thoughts leaves one unpracticed and unskilled at handling them.

Edit for OP:

I find that a habit of exercise helps to redirect that restless energy. After a 3-mile run, I feel strong and healthy and ready to focus on the tasks at hand. If you distrust this but don't have that habit in your life, then prove it to yourself with a 30 day habit of cardio. It's worth knowing.

Beyond that learning a meditation practice helped me immensely. I don't keep up with that as I should, but it's in my toolbox now and I use it as needed.