Currently I would try to put in like 15k into an index fund quarterly, while leaving the rest in a HYSA until the next deposit. And say after your initial deposit there's a 20% dip within a month. I would use the next deposit to buy that dip and hold off on the scheduled buy.
That’s too fancy. Time in the market is better than timing the market all data every created by man shows this. Why do you ask? Well you probably know - no one knows when the market will dip and if it ever dips. In theory that idea sounds nice but practicality of it is basically gambling. If the market doesn’t go down for 5 years I just got 10% in the S&P vs your 4%. Then every if it dips I am still buying in because I am DCA.
DCA into S&P index fund and forget about it.
Only holds cash positions for 6 months of emergency savings, 2 months of actual savings (for living), and if you’re saving for a house (if you need it in 1-3 years) in high yield savings. Citi Bank and Discover all have 4%.