Should I keep writing this story?

If I do keep writing this story, should I go and rewrite my older chapters better, in third person, or should I just keep adding on new chapters? I could make another book, basically just the rewrite and name this one the old-Hidden so you can still read this if you want to.

I feel like there isn't too much mystery and the writing is VERY cringy, so I think rewriting everything will give me motivation. The story will essentially stay the same, except I have actually learned you can skip forwards in time so you won't have to read through tons of essentially useless and uninteresting info about their day!

Anyways, scrap, rewrite, or add on?