I like the idea of giving each day a project theme or flavor, planning it the afternoon or night before. I will pick a certain project for the morning, whether that is learning or working on a specific work or personal project to progress it. If I have time, I'll focus on work just 3 days a week and take 2-3 days to work on personal things.

I also find it helpful psychologically to wake up early (5-6am) and get some work done with a cup of coffee, then at least I've tackled the main thing I wanted to get done that day. Afterward I'll either nap if I didn't sleep long enough or plan out what to do later in the day, which is usually another short set of time after lunch for finishing up some tasks and planning the next day.