BTC trading, you don't make bitcoin because you need bitcoin to start trading, you only make profit if you are good in trading.

The rest like mining (requires huge capital for good mining rigs) and yield farming, these are investment that requires capital, you can acquire bitcoin when you buy but like I said, you don't make it, unless you work for it, example in the OP is survey, my only concern is the amount you'll make, I don't know if it will satisfy you.