A new kind of investment that you could try is cryptocurrency. The most famous of them is Bitcoin. At one time, you could buy a Bitcoin for a few cents and now one Bitcoin is worth thousands of dollars. Many people became millionaires because of this. However, people have lost a lot of money as well. The price can fluctuate wildly and any cryptocurrency is considered to be a highly risky investment.
As you can see, each kind of investment has its pros and cons. Which one is best is up to you.