No need to try to change your style in 1 day
Don't try to completely change your style and do an overhaul of your wardrobe in one day. You'd better set small goals, instead, when it comes to wardrobe and style, and achieve them gradually, in steps.
Start with the simplest step - remove things from your wardrobe that you don't wear.
Spend an hour sorting through your wardrobe and first throw away unwanted items that are worn out or don't match your current style.
You may follow the two seasons rule: if you haven't worn any piece of clothing for the last two winter seasons, say goodbye to it, because you will most likely never wear it!
Remove any items that are stretched, unsuitable or lumpy.
In your closet, you should only have those clothes and shoes that suit you in style.
On another day, clean your wardrobe by sorting and separating items by category and color: tops, skirts, trousers, dresses, etc., and then try organizing them from lighter to darker colors. Here you can evaluate what is missing in your wardrobe.
Do you have the most important and basic items in your wardrobe? If you answered "No", make a list of what you are missing.