My journalling is part of me letting go or managing worries, among other things. So if you're specifically doing a practice like worry time, then you could prompt for

• what is making you feel anxious?
• when you felt anxious, how did you know?
• what are you thinking about when you're not busy?
• is there anything you know you have to do but aren't doing?
• do you know why you're not doing something?
• what do you think would wrap things up perfectly, if perfect could just happen?
• what do you wish for?