She may choose to stay with me. At least for now. Because she likes me as a person. But she does not feel romantic love for me. And she won't ever feel that unless and until I triple or quadruple my income.

News flash!
Tripling your income won't make you or your wife any happier than you are now. You have to be happy before you can become happier.

Happiness is influenced by outside circumstances, but it comes from within, by learning how to accept what you cannot change so much, and CHOOSING to focus on the good things in life instead of the bad.