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You have a real challenge. Anything over 1500M can be a problem. Several changes will need to be made to humidity, ventilation, temperature, etc.. Can you acquire an oxygen concentrator or generator?
The following read will be of great help to you.
https://thepoultrysite.com/articles/incubating-eggs-at-high-altitudes
Were the eggs that failed from your eggs or eggs produced at lower elevation?
It is likely if you acquire eggs laid by hens living at your elevation, natural changes to the egg shell may take place.