"You won’t be the best value trader, the best growth trader, the best day trader, and the best long-term investor. If you try to do it all, you will most likely end up a mediocre jack-of-all-trades. You can’t say that a trader is a trader any more than you can say that a doctor is a doctor. Can a physician be the best brain surgeon, the best heart surgeon, the best psychiatrist, the best pediatrician, the best rheumatologist, and the best bone specialist? Of course not. Consequently, you will enjoy market cycles when your trading style outperforms other styles, and you will also learn to accept periods less conducive to your style. I doubt you will overcome these less favorable phases by adopting a different style each time you run into difficulty. When it comes to stock trading, I know no one who, for example, can successfully trade value in one cycle and then switch to growth the next or be a long-term investor one day and then a day trader to suit the market du jour. To become great at anything, you must be focused and must specialize."
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