You can restart your town... or, I can give you some viable alternatives.
-"I only like one villager (mitzi)" Get the other villagers to move out and take your chances with the void. You might find a villager you like who you never heard of. Or, get the other villagers to move out and find a camper you like by camper resetting; get the camper to move in.
-"Villagers built their houses in the worst places." Well you only like one villager, right? Get the others to move out, then lay paths everywhere except the places you want your new villagers to move in.
-"Hate the map" Can't really help you there. I'd need screenshots of your map in order to correctly asses how bad it is, but good landscaping can fix that.
-"Don't like some of the public works projects" Knock them down and get a villager to suggest you some better ones.
-"Flowers are not colour coded" Go to the island and find some flowers that would match other flowers nicely by touring. You can't get colour coded flowers without putting in effort, no matter how much you reset.
Resetting won't fix all of your problems, but a creative mind will.