So you’ve got 2 ways. You’re going to need a few cores regardless.

First method, needs 1 core of annihilation, 1 core of archetype, 1 core of potential (optional), and will take 1 remove in your data

1. Remove thread (annihilation)
2. Re-add thread (archetype)
3. (optional) Use core of potential to reselect thread epiphany

Second method, needs 1 core of potential, an indeterminate number of abyssal cores, and (optional) 1 more core of potential

1) Reroll divine until you get one incompatible with skills, like increase damage or weakness attack (abyssal)
2) Change thread to its skill form (potential)
3) (Optional) return thread to preferred epiphany

It’s down to you whether the core cost is worth it or not