The market goes up and the market goes down, but it always goes up more than it goes down. As long as you are steadily (Weekly, bi-weekly, monthly) buying stock index funds you are practicing "Dollar Cost Averaging." And as long as you are in it for the long haul, you are going to come out on top. Simple as that.

Dollar Cost Averaging explained...

https://www.nerdwallet.com/blog/investing/dollar-cost-averaging-2/

Stop worrying about dips in the market. I'm investing over 1/5th of my pre-tax income in the market and I ain't skeered.