I accidentally deregistered my current number on iMessages please help

Hello, Missa1047. Thank you for posting your question to the Apple Support Communities. We understand your situation and how you will need to activate your phone number with iMessage again. We’re happy to help you with the available options for this. 

From what we can see, you have already been able to read over the Apple Support article that explains how you can remove your phone number from being used with iMessage. To continue from here, we’d like to provide you with an additional article that we think will help. This next article explains how you can set up iMessage on your iPhone: 

Set up Messages on iPhone - Apple Support

To activate iMessage again, first open the Settings app on your iPhone. Choose Messages here, and then toggle the iMessage on. You may want to toggle this switch off first, and then back on. 

If you are noticing an issue when you attempt to activate iMessage, we’d suggest completing the troubleshooting steps in this next article: 

If you can’t turn on or sign in to iMessage or FaceTime - Apple Support

Once you are seeing that your phone number has been activated with iMessage again, you may be interested in enabling Message in iCloud. This feature helps you keep your message history updated and available on all of your devices. You can find out more about Message in iCloud here: 

Use Messages in iCloud - Apple Support

We hope that the information in our reply here helps you get iMessage up and working again with your phone number. Please let us know if you have any other questions. 

Have a great day!