Can they obtain a non-availability certificate with accompanying affidavits from individuals attesting to their knowledge of birth?

N400 filed in March 2020 online and there has been no update since then? (Indianapolis office)

Best to continue contact with USCIS, reach out to attorney and be patient as processing times vary.

Can I still work if my automatic 180 days extension is over under C9 category?

Yes you may continue working with the automatic 180 day extension.

My drivers license is expired I wanna renew it but my green card is expired

Contact your local DMV to determine if pending receipt for GC renewal is sufficient for license renewal.

Hello Lawyer! I have applied to my naturalization ! I got this message. My estimated completion time March 2021

Best to refer to the USCIS processing page for guidance.

Yes they may remain without receipt as long as timely petition was properly filed.

If you applied for extention of stay and exited before 6 months of you extention will it affect future visa application?

No but you may consider withdrawing the petition upon departure.

Receipt notice l-797C for form I-751 delays?

Yes you may travel with the conditional GC and return prior to its expiration.

I-864 when you are not employed or when income is not enough?

Every joint sponsor requires a separate I864 and there is no fee.

Best to submit the past 3 years even if not specifically requested.