Time in the market
Staying invested longer instead of timing it.
"Time in the market beats timing the market" is one of investing's best-known sayings. It means the length of time you stay invested matters more than when you buy.
Why it holds up
Compounding needs years to do its work, and markets have historically risen over long stretches despite frequent drops along the way. Every year spent waiting for a better entry is a year of growth given up.