Two comments to help you develop your thinking on risk...
People think (with good reason) that some diversification removes risk from your portfolio that you aren't paid extra return for bearing. This "removable" risk, called unsystematic risk, doesn't jack your return... only jacks your risk... you don't want to bear that risk because you don't have to...
Risk you can't diversify away, called systemic risk, you do get paid extra return for bearing. But you need to be careful to recognize that while the median outcome is higher with riskier investments like, say, stocks, the variability in your outcomes widens.
You can buy a ten-year bond, say, that pays 2% or 3%... but that amount is guaranteed.
You can buy the stock market and hold it for ten years... you may expect to earn 4% or 5% in real terms... but a reasonable guess as to the range of outcomes may be from 0% to 8%...