Yes, you need to amend your 2017 return to show that you no longer live in the home for which you received the 2008 homebuyer credit. Then you may also need to amend 2018 to correct the homebuyer credit repayment.
To overcome the rejected 2019 return you must file by mail because the IRS system is still showing that you owe a repayment of the credit. The only other option would be to indicate that you are still using the home in 2019, repay the credit amount, and then amend the 2019 return afterwards.
Here is a TurboTax article that will help you get started amending your returns:
How to amend (change or correct) a return you have already filed
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