After 4 years studying Forex I learned something called Positive Expectancy.
For example, in roulete game, your positive expectancy is:
Winning% - 1/38
Losing % - 37/38
Reward - 36
Loss - 1
Positive Expectancy = Winning% x Reward - Losing% x Loss
PE = 1/38 × 36 - 37/38 ×1
PE = 36/38 - 37/38
PE = -1/38 = - 2.63%
In short, no matter what you do, the house (Casino) has an edge. You only have luck to win the house...
But Casino has an insurance against lucky players: a max bet value.
But in Financial Markets, you need to do like Casino: a positive expectancy strategy with small bets in the long run.
Let's say your strategy has a winning ratio of 40%, a reward of 2, and you trade 20 positions a month, risking 0.5% per trade...
20 × 40% = 8 winning trades = 8 x 2 x 0.5% = 8% reward
20 x 60% = 12 losing trades = 12 x 1 x 0.5% = 6% loss
Monthly profit = 2%.
A 2% strategy means 27% a year... not bad, because 70% of retail traders fails! Why?
They don't have a strategy, they don't have money management. They only trust in luck.
If you want to win in market, you need:
1) a strategy where you know your risk (loss)
2) a strategy where you know your reward (profit)
3) a strategy where you know your winning ratio.
These 3 questions are not answered by 99% of Expert Advisors. Because Martingale/Grid/Averaging strategies (very common in these EAs) doesn't have a known risk. If a trade goes wrong, these EAs increase the risk in a new trade, to cover the previous loss and make some profit.
3 months of backtesting in a strategy that answer these 3 questions is enough. 1/3 months in foward test in a demo account is enough. Start small in real account, and be happy!
Trade safely... Remember, a high Drawdown means a high risk!