You already know. She has easily told you a dozen times before she left. If you honestly don't know, then ask her.
Women can be hard to please sometimes, but if you tell her honestly you want things to be the way they were and that you want to give it a second shot from scratch; she should be able to understand. If you're still married, remind her of the wonderful time you spent together in the past, offer to take her to the places that you used to frequent in the old days. If you have kids, leave them with the family, or someone you trust.
All these recommendations are not guaranteed to work but this is only a small list of the things I would want to redo again with my own husband and can't because of all the excuses he gives me all the time. Relationships are tough, but hang in there.