Something you said about rituals popped something in my brain about this; You've got four distinct roles; why not associate them with distinct places, items, and rituals? If you think of each role as a different fictional character, each one gets his own costume, props, and sets, which keeps them distinct.

So, when you're reading, select a particular chair or corner of a room and sit there. If you're going to make a drink, have a particular cup you use while reading. Take off any formal clothing like ties and jackets. Keep out of sight of your writing desk.

Then, when you do tutorials, grab a particular pad and pen, use a different coffee cup, put on a jacket or some other particular piece of clothing you wear at no other time.

When you write, get neat and organised, maybe in contrast with a relaxed and slobby reading environment.

The idea is to get your brain to associate the different situations with different states of mind. Once you get used to reading in a particular way and giving tutorials in a particular way, it's easier for your brain to know what it's 'supposed' to do in a particular situation. They advice insomniacs not to do read in bed for precisely this reason; insomniacs associate bed with alert activities, so they find it harder to sleep. Once bed is for sleep and the living room is for reading, the right situation triggers the right behaviour.

Hope that helps.