You've tried the app, the tracker, the resolution, the fresh start on the first of the month. Each one held for a fortnight. Then the pattern returned, quietly, the way it always does, and took a bit of your confidence with it on the way back in.
You didn't fail through weakness. You aimed at the wrong part of your mind.
Why willpower runs out
A habit isn't a daily decision. It's a pattern running on autopilot, built over years, sitting well below the part of you that's doing the deciding. That's exactly why deciding, again and again, has never been enough to shift it.
Your hand reaches for the packet, the fridge, the phone before conscious thought even arrives. The part of your mind running the behaviour was never included in the decision to stop, so of course it keeps running.
This is why willpower drains. You've been asking the thinking mind to police an automatic one, and nobody sustains that for long, not because you're not disciplined enough, but because it's the wrong tool for the job. Change happens at the level where the pattern actually lives.
What changes
This isn't another tracker or another fresh start you'll need to renew in a fortnight. It's working directly with the automatic part of your mind that's been running the old pattern, so the new one doesn't need constant policing to hold.
The Monday commitment that's still there on Thursday. The reach that goes somewhere else without a fight. A version of this that doesn't cost you willpower every single day, because it's not running on willpower anymore.