The formula of stable profit of foreign exchange transaction

Some people like to focus on the signal and make a big profit
Some people like to see the general direction of light warehouse holding long to achieve time for space
Some people like to watch the short-term volatility, and work hard to accumulate more
It's better to take a big position
Light warehouse holding long or not
Or grab the hat and pluck the hair
All of these are just trading strategies, far less than a trader with sustained and stable profits.
What is the formula for stable profitability?
I think there are the following points:

1. We must not make a big loss;
2. Normal small loss
3. A normal small profit
4. The occasional big profit
   In any case, you can't make a stable profit. This is often due to the overweight position, which will only make you make or lose money in a short period of time. However, as time goes on, you won't get lucky every day;
   The normal small profit and small loss is framed by the market operation law. There are many volatile markets and few trend markets. Therefore, we make small profit and small loss most of the time, which needs to be understood;
   The occasional big profit is based on the normal small profit and small loss. We can decide how much we lose, but how much we earn really needs the cooperation of the market, which is difficult for us to be sure.
   Therefore, the formula of stable profit = never make a big loss + make a small loss normally + make a big profit occasionally