You will be required amend your 2017 return. You would enter the 2016 Foreign Tax Credit carry forward on the return to determine the amount of the credit to be carried forward to 2018. The 2016 carry forward will be on the 2016 Form 1116.
You would then amend your 2018 return. You would enter the 2017 Foreign Tax Credit carry forward on the return to determine the amount of the credit to be carried forward to 2019. The 2017 carry forward will be on the 2017 Form 1116
You will then use the 2018 Form 1116 to enter the information on your 2019 return.
If you do not do the amendments, the IRS will eventually question where the carry forward came from on your 2019 return.
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