Yes, if you have not mailed it you can e-file. Please see below on how to change from mailed return to e-filing your return:
https://ttlc.intuit.com/replies/5561257
To obtain last year's AGI, you can order a free transcript instantly from the IRS that will give you your AGI. Please see the link below for steps on how to obtain the transcript:
https://www.irs.gov/individuals/get-transcript
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