Anchor the habit to an existing moment
Tie the journal to a repeatable cue like getting into bed, finishing dinner, or the first quiet moment after work. That is often more durable than setting a dramatic new routine from scratch.
Let quick entries count
Some days deserve paragraphs. Some days deserve three honest lines. The habit survives when both types of entry still count.
Use structure when the mind feels cluttered
Mood, meals, movement, gratitude, and one reflection line are enough structure to keep the page from becoming overwhelming without making it sterile.