Change your passwords. While this may seem an annoyance, it can actually do a lot of good. Many thieves find ways to access accounts and information with a few simple clicks and a lucky guess - the more difficult the password, the better. ID theft protection 101 teaches that you have the ability to make it more difficult for thieves - so do what you can to keep the crime from happening a second time.
Implement some type of identity theft protection. You may already be using a service like an identity monitor or credit monitor, but it's imperative that you continue to use the service even after the theft has occurred. These services aren't meant to stop the theft, but to notice it; continuing to use these services will not only ensure that your accounts are always under surveillance, but give you peace of mind at the same time.
Be understanding of the nature of the crime. Though you may feel as if there were a lot of things you could have done in order to prevent the information breach, the truth is that many people that carefully monitor their accounts and try to be safe and careful with their information still fall victim to thieves. These people spend their lives breaking into the accounts of others - a few passwords or security keys aren't always going to stop them easily. The fact that you were victimized doesn't mean that you're a bad or foolish person - it simply means that you've come to rely on the Internet or credit cards for a great many aspects of your life, and someone took advantage. Though it is a rough one, this type of situation can truly be a valuable learning experience.