Nothing you did in 2019 belongs on your 2018 tax return. Enter only the information relevant to your mortgage in 2018 on a 2018 tax return. If you have anything about your mortgage for 2019 to enter you will do that when you prepare your 2019 tax return--in early 2020.
Also--paying off your mortgage will not be relevant. There is no deduction for paying off the loan. Only interest paid on the mortgage would be deductible.
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