Trying to improve Phantasmal Force

I'm making a warlock mod inspired by the 2024 version of the class. One of the thing I want to improve is Phantasmal Force.

Right now it's pretty weak and not very useful; 1d6 damage per turn, for 10 turns with a save every turn.

What I'm thinking of doing is:

• 2d6 per turn
• for 5 turns
• the target uses its action every turn to try to dispel the phantasm (either by doing an intelligence saving throw OR a contested skillcheck between your deception and their investigation)

I think it's closer to the wording in the player handbook where the target may use their action to make an investigation check against your spell DC to lose the effect.

what do you guys think?