How to unjailbreak my iPhone 5s with iOS 9 with iTunes and then get all of my data back?

I want to unjailbreak for many reasons such as battery life and things like that.

When you jailbreak your phone, you commit yourself to mobile phone hell. You can't come back after you have done it.

Backup the phone beforehand, then restore & then restore from that backup, using iTunes.

You can do it by doing a factory reset and also get the best security app, that would be Leo Privacy Guard.