The promise to start later deserves a real date if you intend to keep it.

Later is not a time. Intentions attached to it never have to compete with anything, which is exactly why they feel so comfortable to make, and why they never turn up in a week that already has demands in it. A date lets the promise fail, and being able to fail is what makes it real.

Take one thing you have been meaning to begin and give it a day and an hour this week. Small and scheduled beats large and someday, every time.