To echo the sentiments of the previous posters - don't forget E3s are seen as a band-aid solution to a skills shortage in the US. There is
zero provision for getting permanent residency. Ask the many Australians flying overseas for expat heavy operators just as the pandemic started, they were the first to go before the locals of the airline. The same will happen when the next downturn occurs - regardless of what seniority you may hold.
Fuel-Off