I can't help you with the Witch Princess but I am an expert at starting over.
I accidently deleted my File 1 slot 3 times and I finished everything in the game in File 2.
When you start over you have a chance to do things differently since you know what is coming. You can stop yourself from selling something that you shouldn't have, you can raise people's heart level in a different order, you can marry someone else, you can play as a different gender.
It can make you less bored by doing something different. That was why I created my second file. Elliott was my first choice as husband but I decided to marry Will once I met him. In file 2, I was able to marry Elliott and found him boring but managed to get more done than I had in File 1.
I would wholeheartedly recommend and suggest you consider it a do-over. Have fun starting over.