How do you choose when to enter and exit market positions to maximize profits or mini

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In trading, it is very important for me to reduce my expenses to a minimum because I am still not very good at predicting the price in the future in order to take profit at the right time. Therefore, I now have a lot to do with luck. But how do you choose the moment to close the position profitably and earn as much as possible before the price turns in the other direction. For example, I know that it is necessary to monitor the trading volumes, which increase sharply after the price should change the direction of movement.