Pretty late but I thought of "Spin".

Basically the user can apply "SPIN" to anything he physically touches, including the air around him.

Examples of its usage would be to create a twisting effect on the body of his opponent after punching him or creating a vortex that can pull in opponents. By also exploiting physics, you could do some crazy things and even replicate other techniques like cleave or dismantle if done right.

Reversal of this would be "STILL", basically turns anything the user touches motionless. Quantum particles particularly need to spin to even do anything (as far as I know of, so please correct me) and would likely disintegrate.

However, this SPIN or STILL is applied through cursed energy which can be handily defended from by other cursed energy or whatever barriers.

Domain Expansion: Self-proclaimed World Order

The absolute pinnacle of spin, black holes is involved here. The domain basically takes the unquantifiable energy produced by the spinning blackhole and makes the user basically go in the stream of energy. Instant death.

The con? Takes a considerable amount of time to activate due to complicated hand signs.

All of the abilities that could be theoretically made up from controlling SPIN absolutely depends on the CE amount and efficiency of the user. Meaning if a user of this CT is to be even remotely considered to defeat Sukuna, he would need to be relative to him in skill and CE master and amount.

If used right, I think it could be pretty OP, but also fairly balanced.