My situation/timeline is this:

 - Submit paper ~ 1 year ago 
 - 6 months in peer-review, at which point I
   sent 2-3 unanswered emails after 4-6 months asking if any update 
 - No acknowledgement of those emails, but major revision decision
   eventually communicated with 4 weeks to do revisions
 - Request (and am approved) for an extension
 - Reach out to editor asking how best to resubmit revised version (since revision option has since expired through the official submission portal)
 - Check-in via email two more times (both the journal [email protected] email, and the personal academic email of the Chief Editor), and have now 4 weeks of waiting with fully revised version ready to submit just to receive advice on how to resubmit

I feel I have done all I can. I have been communicating with the Chief Editor, and the Associate Editor who handled the paper is seemingly anonymous so I cannot contact them. 

The journal is a small-ish, but reputable journal in the field. Because of it's size, there is just the one Chief Editor, and there are no official admin staff (Assistant Editor I think it is called?) who I can contact at the journal.

I am at a career stage where first-author publications are so important. These delays suck. I'm trying to be respectful but also look out for myself here, but I actually don't know what else to do.

Do any Editors out there who have any experience of handling such a situation from the journal-side have any advice?