Yes, you can amend your returns from 2013 to 2020 to add this capital loss carry forward. You should do them in order starting with 2013, so that you will get the correct carryover amount.
If your carryover results in a refund, the IRS will not refund your money for 2013 through 2017, but they will issue a refund for 2018 as long as you file it on or before April 18, 2022.
You have some time left to amend 2019 and 2020, but it makes sense to file all of your amendments now to make sure you report the correct amount on you 2021 tax return.
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