I have kept a journal for 4 years now, but I write in it about once or twice a month, so I’m quite far from making it a daily activity. Mostly, I use it to record my life for the “future me”. Reading what I wrote 4 years ago is fascinating. I can see how much I evolved (which is hard to notice on a daily basis). Synthesizing everything that happened in a month is a great writing exercise. Also, funneling many weeks of events into writing helps to detect patterns and derive life lessons.
Maybe I don’t use my journal enough as a tool. Yet, on a daily basis, what really helps me filter through my thoughts and keep what is important on the surface is my meditation practice.
In any case, it’s great to encourage a journaling practice, whatever the frequency is!