Unfortunately your device needs to be erased but you might want to cost the method of how you'd want that done, see this Apple documentation for full details.

Unfortunately your device needs to be erased by one of the following procedures

• If you've synced with iTunes, use iTunes.
• If you're signed in to iCloud and Find My iPhone is enabled, use iCloud.
• If you don't use iCloud and you can't sync or connect with iTunes, use recovery mode.

Apple has a support document describing the steps in detail, see If you forgot the passcode for your iPhone, iPad, or iPod touch, or your device is disabled.