the first thing you should do is review your account transcript at the IRS website. probably only 2015-2020 are available.
https://sa.www4.irs.gov/eauth/pub/login.jsp?Data=VGFyZ2V0TG9BPUY%253D&TYPE=33554433&REALMOID=06-000e...
it's likely that the IRS may just have ignored the difference because the change in taxes would have been small or none. if the amount was large enough the IRS would have taken the amount due from your next year's refund or sent you a bill. so before filing a bunch of amended returns consider how much is involved both from an unreported income and taxes owed. I certainly wouldn't file an amended return for any year the IRS records show a $0 balance. also if you have state income taxes, by filing the amended returns the, IRS would likely inform the state. states are much more likely to go after small amounts owed.
2020 can be amended and submitted online. for 2019, 2018 and 2017 you would need to contact Turbotax support to see if they will push desktop downloads to you. they can not be amended online or efiled.
Turbotax no longer supports years prior to 2017. you would have to do the amendments manually.
