That's true some people are not fully consistent and not on their full concentration when doing trading that's why it's hard for them to think what is a good decision and what's bad also if you are not on full concentration there are things that you might miss and that's not really good in trading.
It's not about full concentration and being consistent- it's about hard work and absorbing the knowledge for experience.
Even if a person is consistent with trading, there is still no guaranteed profit on his end. Trading requires a great deal amount of experience and knowledge on the market. When we mean by knowledge- both the extrinsic and intrinsic factors should be considered that affect the price of cryptocurrencies. Then after that, full concentration would follow in order to track down the price and sell them at ATH.