I didn't manage to do this with all the pages I wanted, though. There were some pages which had better memories on the other side, or other pages that had nice journal entries that I wanted to keep. For the sake of those better ones, I kept those 'dark' pages in the journal.
Yet, I didn't want to keep reminding myself of them every time I turned the pages. So I hit on a plan with an old calendar.
I had bought this calendar from Workman Publishing in early 2016.