For everyone following the changes happening at Twitter, consider taking the following actions be taken before Saturday:
Update your Twitter bio to reflect that it is the official account. Since the blue check marked the account as such, you might have removed this; so take a moment to double-check it has been done.
Secure any unused Twitter handles you think someone would use to mimic your account and remove them from consideration as possible misleading handles.
Make a private Twitter list of accounts with handles that might be used to impersonate your account. Include those that are active but dormant so you can keep an eye on them in case they start tweeting again.
Alert authorities to any accounts that could be used to commit impersonation.