@8extra my struggle with your situation is as follows :
(a) Lack of knowledge of all the countries you worked in -- were you employed by an entity and if so where is it located?
(b) what was the nature of your work ?
What we need to understand how to determine whether you were an itinerant worker or had a tax home ( that you always returned to after your trips to pother countries) .
Next we need to be sure that while you travelled from one country to another, we count only the days that were in foreign countries including its territorial waters --- international waters cannot be counted as days spent abroad.
Please could you tell me more ?
In the meantime you can familiarize yourself with pages 15 and 17 of IRS pub. 54 --- >
2023 Publication 54 (irs.gov)
pk
