You can amend the 2016 and pay what you owe. However, it will probably not process in time to file this year's return on time. You might need an extension for this year's return.
Another option is to file 2019 without and then go back and amend both.Returns cannot be amended until the money part has been settled.
Here are links to help you:
Where's my refund
file an amended return.
track an amended return
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