US Immigration from Zambia

Hey everyone so I have a bit of a tough situation to figure out and I'm hoping someone on here can help.

Here is my brief timeline

Dated for over 7 years,

Applied for and was approved for Cr1 GC in 2016.

Marriage ended in early 2018 a few months before the 2 year mark.

Filed for I751 with divorce waiver in august 2018

Received notice of action

Never received biometrics appointment

Case status still states, Finger print fee received

I've had infopass appointments, received the i551 stamp in my passport twice now, but case is still pending with no action taken only moved from CA to NE late 2019.

This august i will have held my status for 5 years since it was granted in 2016.

So my question is, with my pending i751 am i eligible to file N-400 even though I'm still technically only on a CR1? But i will have had that status for 5 years due to the massive delay on my case.

I'm hoping that filing the n-400 will give my case the shove it needs to move along.

I'm not worried about proving the was entered into in good faith. As stated we were together for 7 years prior to marriage, and i submitted ALOT of proof of our legitimate married life, it just didn't work out as we had hoped.