What can i substitute when I'm being asked for 2023 Form 2210 but I filed via mail last year

Are you sure that it is asking for 2210?   You need your 2023 AGI in order to e-file 2024.

Where do I find my AGI?

https://ttlc.intuit.com/community/agi/help/how-do-i-find-last-year-s-agi/01/25947

Your 2023 tax return shows your 2022 Adjusted Gross Income  (AGI)  If you filed a joint return then the AGI is the same for each of you.

Form 1040        line 11

If entering the amount from your 2023 tax return does not work, then try entering “0” instead.  If that does not work and you still cannot e-file, then print, sign, and mail your tax return.

You can get a free transcript of your past return from the IRS:  

https://www.irs.gov/individuals/get-transcript

Note: If you filed late or amended your return, your correct 2023 AGI may not be in the system.