I thought this was going really well at the start and I still have hope. The idea of your personality being hijacked by the villain you reincarnated to, and channeling his evil inclination into raw strength with lingering arrogance rather than going full evil or completely changing to a hero is, I think - a fresh touch on a generic trope. Its kinda losing its cohesion and interesting progression but I have hope, 8/10.
Was my score before the cringe slavery justification (which was braindead), My hope is its just a momentary blip of poor writing trying to represent the original personality trying to takeover but the harem elements aren't giving me hope

, 7/10.