Everyone looks like a genius in a bull market
^ this right here. Its like crypto in 2017. Any and everything was making money.
Folks have to realize that the bull market won't last foever. Like @FabTrey said keep some cash available so when the market crashes cause it always does. Then you can buy shyt on the cheap.
Second if you got a short term account. Take some profits to cover yourself. For IRAs you don't have to worry as much unless you will be retiring soon. Then you need to move your money in safe investments.