Impossible goal: 200k working 4, 8 hr days

The biggest “impossible” in this goal is the working 4, 8 hour days. I am always working yet I know I could do way more and manage my time so much better. I want to know how I even take the steps to going to 4 work days – the thought paralyzes me. Do I just do it and see what happens? I really want to kill it at work and give myself permission to rest on my off days but those sneaky work tasks like to consume my brain and then I end up working late, getting up early. I schedule my work tasks, filling my calendar 3 months out and then more detailed a month out but wake up every morning writing down all the things I need to do – I think that I don’t trust myself.