Willpower = Confidence ... being bullied and/or r*ped lowers the stat ...
I do not recommend to keep it low ... unless you plan your MC to be everybody´s cock sleeve and punching ball ...
Easiest way ... Cheat Menu ...
Immersive ... get your MC drunk (not horny/high !!! ) and ride the bus at nighttime ... walk the streets in the nude or slutty outfits ... anything, that provokes men to molest/r*pe your MC ...
Do not do sports, bar job or social activity ... they raise confidence ... sports and hard work raise your fitness, which raises the chance to fend off attempts to r*pe/molest ...
Do set Danger Days within the Cheat Menu to True ... if False, random r*pe/molest encounters will almost never trigger ...