Missing the top 10-20 best trading days in the market over a 15-year period significantly reduces returns (by over 50-70%). The best long-term strategy is to consistently buy and hold without selling.
"if you had just missed the 10 best days in the market over the last 15 years your overall return drops by more than 50% and if you miss the best 20 days your return drops by More than 70% that's why buying and then continuing to buy in without selling is going to be the best strategy to make the most amount of money long term"