my personal info has been compromised?

10 days ago, I believe a hacker able to get hold of my tax return. It has all my personal info on there. name, address, dob, social?

what should I do at this point, I live in USA.

?2020-04-20T13:55:02Z

How do you know for SURE that your personal info has been exposed?? If you're absolutely sure the info has been stolen or whatever, notify all your credit card companies, the bank, etc.etc.etc. Also be sure to contact the IRS & inform them of the suspected breach. Change passwords to all accounts you may have. 
What makes you think a hacker got hold of your tax return??? Did you file electronically?...by paper?????