Tracking fails for the same reason practice fails: over-design. Three quick ratings — mood, energy, clarity — plus one tag and an optional sentence takes twenty seconds and produces data you will actually keep. A page of journalling every night does not survive February.
Rate the day as it was, not as you wish it had been. A log that only records good days is worse than no log, because it teaches you a false pattern. The threes and twos are where the useful information lives.
Log at a consistent time. Evening ratings and morning ratings measure different things, and mixing them makes any pattern you find unreliable.