US Immigration from Argentina

Me and my partner are looking on what we can do to be together, and a K1 visa looked like the best way to proceed. English isnt my first language, so please be undestanding of any typo.
We have been dating for two and a half years, recently had our first in person meeting and have talked about our intent to marry.
Thing is, i've been reading this site for the last few days and all I have read has really discouraged me. Despite being together for weeks, we focused more on having a good time together rather than taking pictures so we don't have as many distinct pictures as other applicants I have read from this sites. Our conversations and video/voice chats are mostly contained on a single app, and I dont know. Dont wanna give away tons of info to internet strangers but I don't think our relationship looks anything like the approved ones from 5+ years old threads about argentinian applicants.
I have read here that since I am from a poor country, a lot more will be asked of us during the interview and stuff. Having had a tourist visa declined (with which I planned to visit her) has left a bad taste in my mouth and leads me to believe that.
Would you say pursuing a K1 visa is a possibility for us, would we have any chance of approval? Should we wait? and if not, what do you recommend?

Does the embassy in Argentina allow co/joint sponsors for k1 visa? Thanks so much!

Hey! We are filling up the form with my girlfriend, she is from TX and I m from Argentina. The thing is that I lived for 2 years in the US while I was studying over there with an F1 visa, so the question is, should we add the different dorms where I lived at to my (beneficiary) address history??

As I've seen happen to others, we received our biometrics screening appointment notification in the mail the day after the appointment. I immediately called and got a friendly person who filed a request for a reschedule and got the the whole "you should hear back from us in 30 days for the reschedule" message.

In reading through similar posts, it seems like just doing a walk-in is advisable because we may be waiting forever to get this rescheduled. The only issue is we live 3+ hours away from where the local office is and I can't easily take time off work to take my husband just to get rejected for a walk-in appointment.

What are our chances if we just show up? We're through the only service center in Maine if that helps.

Thanks!

Hello everyone. I'm in the AOS process and I received a notice for interview including a list where they ask for an affidavit of support. Does an individual with his family and an approved EB2 I-140 NIW submit an I-864 form? Thank you in advance.