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C. A. Lindbergh said, you never know how to fly until you teach someone else how to fly (or words to that effect..."Spirit of st. Louis")
There is a unique NICHE of instructing...it is teaching the very, very wealthy how to fly. charge twice whatever the going rate for golf lessons by the best golfer at your local club. demand safety, even if they threaten to fire you...teach them to fly during cross country flights for their business...but charge your time for waiting too.
I know one guy in the USA who did that and made good money (100k)...but you have to stand firm on your rates...and you may not get any students for a long time.