Keeping such a long-form journal is really time consuming. Fantasies of devoting lots of time to recording deep thoughts and in-depth recollections usually founder on a simple reality.
The solution? Keep the journal idea, but ditch the length. Write down a sentence or two each day to record your most prominent memories.
One sentence is enough. Just make sure you keep your journal somewhere handy to make recording that short recollection of your day convenient, avoiding any excuse to skip days.