You can be wrong half the time in the market and still do just fine.
Worst case a stock can goto zero
Best case a stock can go up for life
The secret is allocation
Deploy enough cash in your positions to benefit from the upside, but hold enough stocks to where if any went to zero it wouldn’t take you out the game.
My sweet spot is usually 5 names, no more than 8
No way I’m able to keep up with 15 stocks on my own during earnings season