You can get a copy of your prior-year tax return, from TurboTax it will have your AGI.
This link How do I access a prior year return? has directions on how to get a copy of a prior-year tax return from TurboTax.
Also, you can request a transcript of your 2018 tax returns from the IRS. The transcript will have your AGI.
This link to the IRS web site Welcome to Get Transcript has directions on how to obtain a transcript of your tax return.
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