US Immigration from Ghana

Hmmm....I received this email below from the NVC today. Not sure why I'm getting this now (instead of months ago) ? It has been much longer than 60 days-- my K-1 visa application has been at the NVC since end of March/beginning of April 2020.

I wonder if other people are getting these emails.

I've done a bit of searching but can't seem to find all the info/have it confirmed:

My spouse and I have been stuck at NVC for over a year- we were DQ'd in May 2020. I (petitioner) have moved addresses in the US and I'm trying to figure out how to make sure everything is changed over adequately. These are the two pieces of information I found:

1. For USCIS: I have to mail in the I-865 form to USCIS. There's no way to do this online?

2. For NVC: I have to fill out the public inquiry form with my new address.

Does this sound correct? Am I missing anything? I want to make sure I'm not missing any steps! Thanks in advance!

The NOA 2 is valid for 4 months, so once it expires , what needs to be done ? Do we write to the embassy or NVC to ask for extension? Thanks

I have a long term B1/B2 visa issued in Ghana by the US consulate. I have used the visa a cuple of times for visits to the US for work related actvity and visit friends. I am intending to tie the knot with my girlfriend (US resident) in December 2022. My current B1/B2 would still be valid by then. I need advice if I can enter the US ith my B1/B2 visa for our marraige ceremony or should I apply seperatelyf or a K1 visa for this purpose? I intend to move to the USA after our marriage and looking for the best scenario to ease the whole process of moving ahead. Thank you!

Western Union gave me a money order for $500 and one for $180. Has anyone had to do this and did USCIS accept your $680 fee this way?