What to do if immigration status taking too long ?

have patient! are you one of those rushing to get your card and be out the door

After you filed your I-751, the first letter you received was the NOA1, extending the validity of your Green Card for another year. That's because processing can take up to a year, although it usually takes only 7, 8, or 9 months, so you are a bit over average, but still in the "normal" time.

What I would do is this:

1) Call the USCIS misinformation line and politely insist to speak with a Tier 1 immigration officer. Don't let the phone drone block you off. They have no clue about anything. Once you have the I.O. on the line, tell 'em you are worried and would like a status update of your I-751. Have your A number ready. You need to know if perhaps your new card was mailed, and you haven't received it. You DID go to the biometrics appointment, or not? If not, something went wrong, and you need to find out what that is.

2) If none of this works, make an Infopass appointment and go there in person, to see what went wrong.

If you filed the I-751 on time you got a letter extending your status for a year ... you still have time

You were supposed to apply 90 days before your green card expires. Apply today! You are leaving it too late.

You were not eligible to remove conditions when you sent your last application in. So they sent the whole package back to you. What you did with it you need to figure out on your own.

Have you contacted them and asked why?

Stay or return to your country.