A good way to win your wife back is through your attitude.
Think about this, would you want to be with someone who is sad and moping and "willing to do anything" to get back with their ex? This doesn't sound like an enjoyable person to be around.
Is this you? If this is you, you need to work on changing your attitude.
While you might feel desperate and like crap, you have to work very hard at changing that.
You need to come across as confident and happy, in short you want to be someone your wife would really like to be with.
Desperation is a feeling you must eliminate, because it can make you do things that will definitely not help you win your wife back.
Try to live your life the best you can.
Of course it will be hard but you have to carry on.
This is where confidence and self-assurance come in.
Your wife cannot sense that you are desperate.
Pretending won't work, she knows you quite well and she'll be able to see through a facade.
If it seems like it will be impossible to improve your outlook, start exercising, even something is better than nothing.
It can help you feel better and more alive.
Do things that will make you fell better.
But make sure you don't start drinking or doing drugs as a way to kill the pain you're feeling.
You need to keep yourself together and positive.
If you don't there is no way you will win your wife back.