Advice for the changing bags we hold

When a stock goes red we often hold the bag waiting for it to get back to zero (hopefully even some grains). This seems to be the common mentality. Wouldn’t it be a better idea to sell at a loss and put the funds into stocks performing better? Am I missing something where leaving it in the poorly performing stock is preferable?

I bought Google at the peak and despite some recent gains I’m still looking at -30%. Google’s performance before the big drop was typically 20% per year. Should I take the loss and invest in some better performing stocks? I have an M1 account I’ve been DCAing the last half a year that’s been doing well.