Remember: it will all be fine. Don’t panic, just keep paddling the waters.

If you thought the SPX was gonna go up at 4400 you still think it will go up at 4000 and you definitely think it will go up at 3000. It might take a while. Add money you can miss on the downturn. And keep steady.

If you think the SPX would've gone to 5000, it will still. The fact that it's going down shouldn't change your perspectives or thesis. Might take longer than you thought before, but it will.

Take a breath. Uninstall your broker's app and/or keep adding (automatically) every paycheck. Don't put any money in you will definitely need within the next 2-4 years. Open a beer.