Do what you feel may leave you most fulfilled on a personal level at the end of it, regardless of finances. Something that will make you say "I'm glad I did that".
What would that look like for you? Helping the poor? Helping animals? Improving the lives of children?
Of course, this is from a viewpoint where I don't see the accumulation of wealth as personally fulfilling. For me, fulfilling would be having made a difference in the lives of others. People I don't necessarily know personally, are better off (not necessarily monetary) for me having done something.
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Always do right. This will gratify some people and astonish the rest.