I file my 2018 return with wrong SSN now using TT the system asked for 2018 AGI and obviously it can match with the wrong ssn What should I do?

You can try using zero as the AGI.   But if zero will not work and let you e-file your 2019 return, you need to print, sign and mail it instead.

https://ttlc.intuit.com/community/printing/help/how-do-i-print-and-mail-my-return-in-turbotax-online/00/26258

As you filed with a wrong SSN last year and with the correct one this year, it is as though you did not file last year.

Please read this TurboTax Help topic.