There are multiple ways to earn bitcoins and your income in bitcoins will depend on the skills that you hold as if you have multiple skills then your income would be even higher and in bitcoins you cannot afford to depend only on single source of income.
Also it depends on how much you are going to invest. Because if you are able to invest in mining rig then it's very possible that you can earn more. But mining nowadays is not more profitable. You can now try to mine alt coins but choose only those alt coin that is very profitable.
Yeah mining bitcoins doesn't make any sense now so its better to mine altcoins that have good reputation so I will prefer to mine etc, eth and xmr as those are the coins that will survive in long term.