Low income earner, 47 yo, $64k pa. Wife, 43, middle income earner, $80k pa.
Home is an old EC, bought very cheap many years ago. Now fully cleared our mortgage.
Household expenses, $100k pa. Household savings, $44k pa.

Can any guru here advise how can I earn more? Should I go into business since I earn so low and hence my opportunity cost is low? I feel ashamed that I am earning less than my wife.

What kind of business can I earn at least $100k pa?