avoiding big selloffs but missing big rallies. imo this has always been the hard part between not pursuing knife catching by waiting for indicators to turn up, but then not missing the huge moves that occur before they do.
I have made many mistakes and am always learning but my current work avoids rushing into buys when vix is way above long term average and scales into buys rather than always go full in.
There is never going to be any perfection in buys and sells, the key is to work with the least imperfection possible, concentrating on capturing as much as possible as often as possibe
You CAN time the market!
But only after you trash the big 3 myths.
Myth 1 - its possible to get every point of every move
...Myth 2 - you'll never have a drawdown
......Myth 3 - you'll never have a loss