There is an app for everything and lots for journaling -from very simple daily prompts to ones that let you include photos and posts from your social media feeds, add in reminders and search previous journal entries. Find and use one* that
will help you process yours thoughts and experiences and capture insights. Ideally it should also be a way to keep track of how things (and you) have changed, and if prayers and questions have been answered.
* Examples of journaling apps (free versions available for all these): Day One, Diarium, Penzu, Grid Diary, Five Minute Journal & Daylio.