US Immigration from Latvia

Mu husband got a job for 18 months in Middle East and we are moving there in the middle of January. The thing is that I have a Green Card interview scheduled at the beginning of January and I am not sure if it is better to attend it or withdraw application and re-file for spousal visa.

As far as I know with Green Card it is not advisable to leave country for more than 6 months and we are still not sure if we do not stay longer than 18 months overseas.

I was researching and it seems my husband can use form i-130 for me if we decide to re-file and start everything all over again at the end of his contract? As far as I am aware in order to apply for CR-1 he needs to live in U.S which will not be the case.

Any advice will be greatly appreciated. P.S : we do not mind to pay application fee again.

Hello everyone Date of expiry for my passport is July 2021. Should I get new passport before filling out DS-160, once our case arrives from NVC to the Embassy to avoid problems in future?

What concerns me is, what I will do once my passport expires in US? Which document I will use to travel and as my identification document?