Fundamentally what you're seeking to do is utilize interest and return on investment, which is another word for interest.
There are many avenues to do this, but being successful in any of these can be difficult. You can use an investment manager (mutual fund, hedge fund, ect.), but will he do a good job? Can you trust him? It then comes back to you to do due diligence upon your investment manager regularly, which requires an understanding of the job he is doing at least on a novice level.
If you take the reigns of managing your own investments, whether into stocks, commodities, a business, or so on; then you have even more work and responsibilities to execute in order to succeed. A lucky investment is just that, luck. Good investors remove luck from the equation and rely on risk/reward analysis, as well as a multitude of other strategies depending on the investment type.
When you take the reigns yourself, you only improve your odds if you can count on yourself to execute the necessary steps in order to succeed. This requires a great deal of real-world experience in order to ensure any chance of reliable success. Failure is more likely in the beginning, until you have the necessary knowledge and skills. With stocks, you can try investopedia which allows you to play with a stock simulator. Read several books on investing in stocks, and play with that for more than 3 years, and you might begin to grasp what it takes to reliably succeed, if you're dedicated and serious. It also requires the right sort of personality.
INFJ's are inherently not inclined to be investment managers. I have dabbled in this quite a bit, and while I could possibly do it, what it requires to succeed is equivalent to a full time job. Without sufficient starting capital, it would be impossible for me to make a living at. Further complicating this would be that some years might be excellent while others terrible. The final aggregate over my lifetime could be nice, but choppy income is not ideal for living a normal life.