Greetings!
If you still have the email containing the 2FA setup code, you can simply add it again to your choice of 2FA app. If you do no longer have that code, you may request a manual 2FA removal.
Best of luck,
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When downloading addons from GitHub you may have to remove the branch suffix (usually -master) from the folder name.
This means that the folder name (inside /Interface/Addons) should match the name of the file ending with .toc (inside your imported addon folder).
It sounds to me like you have been muted for flooding the chat. It usually lasts ~1h before resetting. Please let us know if you're still unable to chat.