Get in the habit of running jj desc midway through a commit. Have you just discovered an insight in an old module? Do you see how you will write the next few hunks of code? Did you have a moment of clarity where you zoomed out and saw what the next week will look like? Document it! Let your commit messages have multiple paragraphs, each written at a different time. Fill your commits with annotations about what you were doing so that future-you will understand past-you.

The reasoning here is that, aside from the jj file subcommands which directly alter the index, almost any jj subcommand will work. You might as well pick a subcommand which advances your goals.