If you moved money from an investment account (stocks, funds, etc.) to a money market or cash account out of fear (or for any reason), then yes, you are locking in your losses from a temporary downturn. Moving from one fund to another similar fund, no, you are not locking in downturns.
Yes, timing the market is difficult, and while DH and I successfully did it one time....moved out of our index funds to a MMF in early November 2007, back in on January 20th, 2009....and missed about 31% of the drop.....it's *very* stressful. Getting out is the easy part....when to get back in is a whole different matter.
We don't need to touch our invested retirement funds for another 10 years. We've built up 3 years of income in our emergency fund...1/2 of that during the pandemic, and plan to add to that over the next 2 years to get us to 5 years. We'll keep our nest egg invested because we are 10 years out from needing it, but will deploy some of the cash we've built up into the market if we see more significant losses in the market. Worst case for us...is that five years down the road at 59 and 58, we'll need to work another year or two.
I do think that this is a pretty dicey period that we're going through....and will continue to go through. The Fed is very limited in what they can do other than go full "Volcker" and really raise interest rates very quickly. They're trying to go about this is a sort of deliberate approach, but increasingly I'm reading from economists, like Larry Summers.....that won't cut it. Inflation is now embedded in wages, rent, homes.....etc, and it's not going to easily be removed. They're likely going to be more aggressive. So, the volatility will continue. If we get a 75 basis point raise, the markets will say..."yay!! Happy days are here again....the Fed gets it." But then a retailer will report that their forward guidance on margins needs to be slashed due to tumbling demand.....and the market will say...."boo....we're probably in a recession!" It's going to be that kind of summer. Having said that....I don't think that this market has bottomed.
I kind of see this time period in the way that Clark Howard talks about buying a house right now. His advice when the housing market is on the warm side has always been....buy a house right now if you plan to stay in the house for 7 years, because prices are high and while we shouldn't see a 2008 style housing debacle, we should expect slower appreciation in coming years. He's bumped that up to 10 years. I see the markets that way right now too....I'm not sure how we're going to return to some of the "pie in the sky" levels we've seen if we're removing a lot of this free money sloshing around on the Fed's balance sheet....and raising rates. The standard advice of...."don't worry about the stock market if you don't need to touch the money for 5 years" may need to be bumped out a bit.
It's going to be a very hot, very expensive and very angry summer here in the States....if that kind of news gets you down.....watch more Bravo

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