Lack of concentration

You can write yourself more 100 rules and trade on them, achieving excellent results, but one has only to break one as the whole Trading Strategy collapses. You need to be constantly focused and focused when trading, avoiding small mistakes leading to sad results.
I don't know how to deal with it yet., After all, I’m a man and my head can get sick, thinking about some problem or just getting tired, a series of mistakes starts to accumulate slowly, resulting in terrible cons.
Recently wrote about a small experiment on strict adherence. his rules and achieved simply amazing results, but then he relaxed and reduced them to almost zero. I try to limit myself very hard, so as not to make stupid mistakes, but not yet – this is my main problem now that needs to be solved…