Should I ask my ex wife to date again/reconcile?

If she wanted the divorce, I don't think it will work, but if she divorced you because of things you were doing, and you stop doing those things, maybe she would consider a reconciliation. It would depend on if she thought you would make some changes or not. If she fell out of love with you, then it probably wouldn't work. If she is happy in the new relationship, she wont want to end it.