Coincidentally, I started doing this two weeks ago. Daily journaling helps me a lot with overthinking and anxiety. The thing with my daily writing is that I don't have any structure or things I force myself to write about. I just write about what's on my mind and feel the need to think about. So, at least for me personally, the Google form and a plethora of things you have to write about seems overkill. That'll just make it harder to stick to the habit and overthink it.

If you overdo the part of planning your next week you can fall into the trap of having a bad day and decide to do nothing for the rest of the week, because you think you've failed already so why even bother.