- Taming the soul of the DF fully/ becoming one with it , simply by training
- "snapping" due to physical and mental trauma
Factors that may enhance the speed/efficacy of the awakening
- CoC surely helps taming something better
- non evidence based (?): being a "soulmate" with the fruit you have, should help
Also a special kind of treatment involving pain, haki especially CoO and CoC, seastone, water might be possible. An additional scientific approach so to say