Teiichi turning curses into blessings, just like Yuuko were through her life, not being remembered as an evil ghost but a guardian of those among living, making memory of her pleasant.
After reading the epilogue, this would be more fitting ending with Yuuko and Teiichi going to afterlife together, because honestly although being able to touch themselves and whatnot, Yuuko would spend her entire life being ignored by everyone and their love would never bare a fruit.
Alternatively, Teiichi moving on after the loss with Kirie mustering her suppressed feeling towards Teiichi confessed and named their child Yuuko in honour of her grandma. Making sure the memories of Yuuko remained as good like her.