It was a little by accident and a little on purpose. Basically I scared the living bejebus out of myself (it's called "hitting bottom" in AA) and realized I was full of shit, but I didn't need to be (a lot like the Evangelical gambit of "You're a born sinner and on your way to hell, but God can save you if you clean up your act.") which is kinda true if you think of sin as missing-your-goals, hell as avoidable-suffering, and God as the class-of-desirable-goals instead of that dogmatic religious crufty myths.

The destination was high conscientiousness, but the direction from where I was was a higher sensitivity to disgust. Mainly disgust at myself and my living space. Cleaning the clutter around me and myself more frequently was a sign I was on the right track. Not quite OCD, but on the way, still a ways short of disrupting my life.

I outlined a plan (as if I made a reasonable and actionable plan to help someone I cared deeply about) to clean up my act and pinned it right over my desk, then kept to it.

How'd I scare the living bejebus out of myself? YMMV, but psychedelics worked for me. Look up The Marsh Chapel Experiment.

Some more real world actions:

https://www.health.harvard.edu/staying-healthy/raising-your-...

And best of luck to you!