Pick a focus you use at work or will use for years

The easiest brand to maintain is one built on work you are already doing. If your job is mostly Django and PostgreSQL, a focus on Rust game engines means finding separate time for both the learning and the writing.

Check a candidate focus against three questions:

1. Do I work with this now, or will I soon? Daily use gives you a steady stream of real problems to write about.
2. Will it still matter in a few years? Fundamentals and widely used tools age better than this month's framework.
3. Do I actually enjoy it? You will spend many evenings on it.

If a focus fails all three, it will not last past a few months.