You are too late unless you are out of the country. You had to request an extension by April 15, 2019. Now your tax return is just late. If you are getting a refund, there is no penalty for filing after the deadline. If you owe tax due, your interest/penalty started adding up after the deadline, so file and pay as soon as you can.
https://ttlc.intuit.com/questions/2549773-can-i-file-an-extension-after-april-15-2019
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