for those who track their net worth, how do you deal with seeing your net worth not move?

Let's say after a hard year of working, where you max out your 401k and IRA and invest outside of retirement, you check your net worth and see it has actually gone down a little bit despite all of your contributions because the overall market was down 20%, how do you mentally deal with that?

I had a goal of hitting 500K at a certain age, but I always knew this goal was majority out of my control since the market could correct at any time before I hit that age, which seems to be happening now.