I hope the stock market collapses by that much because then I will buy as much as I can. But I think you will fine that you will be wrong. The last 10 years was bad for stocks, but the chance of that happening again for the next 10 years is slim to none...ASSUMING the world doesn't go nuts and spin off into WW3, but despite what all the Trump haters are saying the big secret is corporations love Trump which is why the stocks have gained a lot since Trump has been elected due to optimism that corporations now see with Trump, and those gains will more than likely continue. On the flip side stocks could indeed perform badly in America and Europe which may be why America and Europe want WW3 with Russia and probably China.
Regardless of whether or not the stocks go up or down the worse thing you can do with your investments is to move them into a money market account, because over the long haul money markets and CD's do not keep up with inflation not alone gain, so you'll end up with more money than now due to the small interest but the buying power of the money you made will be less than it is now. I know that may sound crazy to you but if you look on the internet at historical gains of money markets vs even the conservative and stable large cap companies.
As Nikhil Sharma said tech stocks will be the way to go, but never but all your eggs in one basket, also consider healthcare, information tech, transportation, and alternative energy funds. Smaller companies (small cap) do carry the most amount of risk but they also carry the most potential for highest rewards, but it's mostly luck that you end up picking the successful ones, so unless you are a big gambler I wouldn't do the small company thing but rather mid size (mid cap) companies to stunt the risk a bit, but it's up to you and what type of person you are.
The biggest problem Americans will face is inflation due to the astronomical $20 trillion national debt that Obama put our country into at $61,500 per person, and this debt doesn't include state and local debt. The national debt doubled during Obama's watch from what Bush did, and what Bush did was bad enough, but to double it was criminally insane. Problem is the debt is so high that it would take 50 years to get it under control to where it's rational and not insane, but with America's record of presidents this control of our debt and paying it down will never happen, thus inflation will be the largest issue as America prints more currency to offset the debt which will in turn make our currency worth less and less to some day a new currency from another country will take over as the world's dominant currency, probably China's.
Keep in mind all that I said is nothing but assumptions, the same is true with anything you read in any magazine, newspaper, media, internet, or CitiBank advisors or any other advisors; these people are all speculating, which means they really don't know, but one theory will be right, but you won't know which theory is correct until time plays out, and whichever theory proves correct does not mean that the article author or advisor that succeeded on having the correct theory will be right the next time, in fact chances are great that they will be wrong the second time around; this is why for the last 20 years real monkeys who pointed at stocks to invest outperformed mutual fund managers!