The stock market is volatile. Investment in stocks, bonds or various funds always bear some amount or risk and are simply out of your control. There is, however, one factor in your finances that you do have control over: your savings interest rate.
Many people focus on earning high returns and forgetting about the common suggestion of financial advisers to start saving early, because savings can almost always produce more income for you than returns, even in the best of scenarios.
The cold hard fact about compound interest is that it can be years before returns become significant. In the meantime, the best way to maximize your investments is to save more.