Any advice for a person who holds a master’s degree and have 20 years of experience but doesn’t speak English?

Is there any opportunity in America for a person with good education, such as master’s in economics and years of experience in running their own business (business related to electronics and automation) but with no ability to speak fluent English? My dad got his degree and run business in our home country. He speaks basic English but not good enough to have a career that requires constant communication with clients or other professionals. I see him doing jobs that are way below his expertise. He practices English as much as he can but it takes time. I was wondering if there’s any opportunity for him he could pursue right now? Don’t ask me why he moved here if he was doing fine, running his own business in another country, and why wouldn’t he just go back etc.

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