No matter what you do, there will be losses, unless you do nothing. What we look at is not a single instance, but the overall account. Any business activity has a profit model, and trading is also a business activity, so it must have its profit model. I believe the profit model of trading is: to profit and lose with my own trading system, but the trading system has a win-loss ratio (which must be greater than 1), so the market will give me more.
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This is a rolling forward model, using war to nourish war, a virtuous cycle.
Can you definitely make money in the market with a good trading system? In fact, many very simple technical methods can theoretically make money.