You seem to be someone that loves a good process and can stick to it. You are creative enough to make the most of the little time you have. 

To create your Service Design Principles Library I suggest you do it one drop at the time. For example: each time you go to the toilet write one line about a principle on your smartphone. Or each time you go to the train station write one principle.

Your strength and resources

1. You have already daily habits

2. You are someone you can stick to a goal once its decided

3. You can quickly get focused on a new task

4. You have great organizational skills, love process and love to use them yourself.

5. You can express an idea quickly

What you might lack

1. You can't schedule long hours of work

2. You don't like to work with others

3. You don't have a budget for tools or external help

How to go further

1. Read the book Atomic Habits to form habits that help you achieve your writing goal.

2. Use the Notion Template or get inspired by it to create your own writing process.

3. Do a routine sandwich: add your new writing routine to a routine you already have.