The best advice I have had was somewhat contrary to yours, but only because of circumstances. Basically it's that people with certain mental illnesses simply can't keep up with the level of output that a lot of writing advice dictates, and that it is better to not hurt oneself trying to live up to that ideal if it means avoiding burnout.

A little writing has happened this week to my great relief, but life continues to happen. Was briefly ill and now I'm worried for my job security. So I'm left taking writing happily when I can make time but trying not to hate myself if I can't bring myself to focus