I know people who do nothing but stick money into a savings account at 0.01%. They have no risk tolerance, I get that. But they're going to be working for decades longer than if they find some alternative investment that nets them at least 3-4% more than that. If you're one of these types of people YOU MUST LEARN TO DEAL WITH MORE VOLATILITY!
The way to do this is mentioned above. When the market changes direction, change your attitude. When it goes up, great! You're getting richer! When it goes down, great! You can buy more at a lower cost. It's like BOGO at the store! Practice this attitude/mindset change every day. Bear markets can last for years, so start small. When the market drops for a day, cheer. When it drops for a week, cheer. When it drops for a month, cheer. When it drops for a quarter, cheer. When drops for a year, cheer!
That way when the market drops 50-70% next time (it will in the next 4 years) you'll be the one running into the burning building, while everybody is running out...