I just replied the below to someone else...try this and see if something happens....
Sadly, I heard nothing back for 2 MONTHS -- and i think once i finally heard back it was because of what i started actively doing, not because it happened naturally on their process side....see below. I knew something was off/wrong because a woman that interviewed the same day as me in Nashville (but with a different USCIS person) got her approval 2 days later (her and i had basically an identical case/immigration process except for the person that interviewed). So I started sending messages via that inbox feature (I never got a real response just a generic).
Finally on February 13, 2023 I was desperate and panicking since there was no traction and no real communication given to shed some clarity, so I went on the USCIS website and pushed through a case inquiry under the category "lost approval letter". I didn't know what else to do and it felt like my case was lost so I figured what could it hurt. Well, it turns out that those inquiries get sent to the field office you interviewed at because on February 14, 2023, i got a response to my inquiry which seems to have come from the field office i went to, saying that their records say I had been approved. I was shocked and said there is no way. Well, i logged in and there it was so that lady MUST have looked up my case and saw how long it was in limbo and just approved it or something because all that was too much of coincidence. And later that day my status in the system that I could check online also changed. SO -- my advice for anyone going in for their N-400 interview and still no green card and they dont approve both on the day of or within a month (for no good reason, i.e., you didn't have any complications in your case) is start sending formal inquiries -- not via that inbox portal in your My USCISC but where you process lost mail/etc inquiries. Wish I did it sooner and honestly i have no idea how much past February I would have been waiting if it didn't do what I did ----