If you don't want to stay on a jailbreak state, you can flash and update your jailbroken iPhone back to latest iOS, here 3uTools shares a thorough reset method which is similar with Cydia Eraser and it will delete all your data on your iPhone 7/7Plus.  

But in case if you want to keep Cydia on your iPhone, you could check How to Restore your iPhone 7/7 Plus to initial jailbreak state?

1. You are suggested to back up your own data for your iPhone 7/7Plus. (It's an important step)

2. Add a repository in Cydia: coolstar.org/publicrepo

3. Add a repository in Cydia: repo.jailbreakhub.org

4. Install a tweak: Stashing for iOS 9.2-10.2

5. Reboot your iPhone after installing, and click "mach_portal" again.

6. Install OSRestoreX, at this moment the jailbreak tweak will remove all your jailbreaking data. Once all data were removed successfully, Cydia should crash when the process is done.

*Please noted that do not power off your iPhone at present.

7. Head to "Settings"-"General"-"Reset"- "Erase All Content and Settings", and wait your iPhone system is reset. 

8. An activate interface should arise on your iPhone, all steps are just like to set a new iPhone.

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