Having an edge does not mean winning often or winning soon. It means that, across enough trades, the average result in R is above zero after spreads, commissions and slippage. Many methods feel right and have none.
An edge belongs to a specific method under specific conditions. It can sit in a setup, a market, a session or a holding period, and it can fade when conditions change. Your record can show this: the same setup may have a positive expectancy in the morning and a negative one late in the day.
The execution side matters as much as the idea. A method with a real edge can be turned into a loser by oversizing, quick re-entries or abandoning rules. This is why the same trader can have a profitable method and a flat account.
Proof requires a sample. A handful of trades cannot distinguish an edge from luck, and even a hundred can leave wide uncertainty. Treat a new method as a hypothesis, trade it small, and let the record accumulate.
Reflect's starting point is that your edge is probably fine and your behaviour around it is what costs money, which is something your own data can test.