You must do the 3 things in the USCIS message.

You missed your N-400 interview and failed to inform USCIS, the N-400 will be denied for no show. Your conditional residency will also be denied...

There is a substantial backlog of pending EAD. The only info available is the processing time which is available on USCIS website.

Overcoming the grounds of N-400 denial is a very high burden to meet. A new application may be filed, so long you enclose the correct application...

IR5 next step is 1-485. The 1-131 advance parol that will permit travel overseas will be next. The I-485 and I-131 can be filed together...

Concur, it is difficult if not impossible to say when you will hear from USCIS.

It appears you may have unlawful presence issue. You stated you departed the US when your B2 expired. Relying on consular advice may not be a good...

He became an LPR at age 27. At 27 years old he is too old to register for the selective service. Those on B2 and overstays are not required to...

It's a good idea to retain an immigration attorney. It appears you are missing some facts. Add whether you were divorced, have children in common,...

Unlawful presence starts to accrue once you leave the US, depending on the circumstances.