I really don't feel that there must be a need to rewrite everything from scratch just add more and more details that make the story deeper. I like how it is now, you should just change the core missions that will unfold the story, especially the Speaking of characters. Speaking of characters I love them all, and they are well crafted and do not require repairs beyond just more development, and the idea of choosing the gender and personality of the protagonist is great, please keep it.
Summing up :
I think always the only thing to improve on is details and more details, from my own experience redoing and redoing a story is more tiring and sometimes we just need to polish the ideas we have already presented. And this is my advice anyway I will wait patiently for The end result, oh and I hope you get better, your wellbeing comes first!and sorry for my bad english...