Here's 2 links I found. Yes you can amend your prior returns if you qualify.
Turbo Tax - Self-Employed Tax Credits and Social Security Tax Deferrals Available During COVID-19https://turbotax.intuit.com/tax-tips/self-employment-taxes/stimulus-self-employed-tax-credits-and-so...
IRS Credit for paid leave and Covidhttps://www.irs.gov/newsroom/tax-credits-for-paid-leave-under-the-american-rescue-plan-act-of-2021-s...
How to amend a prior year
https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-return/amend-change-correct-return-a...
