~snipped~
I have tried this strategy many times and it works best for me, I bought an asset when it was decreasing, I bought it again after a decrease of about -30% , and the last one, I bought it again totaling three times purchases.
I was patient with the trade and believed in the strategy, after three months, the asset starting spiking up higher far above the initial price I bought at.
You got it slightly different from what OP meant. OP meant proper trading as in Futures Trading, not Spot Trading. What you described there was spot trading. We can't refer to spot trading as real trading. I tend to see it as investing to hodl. It's hodling, sort of, if you get my drift there.
What OP meant was that once your indicators or strategy signals you to buy, you should get into the opposite. That's sell. If it signals you to buy, you should start selling.
What you just described there is called DCAing. In Forex Trading, it's called martingale strategy. You buy when an asset drops. You continue to buy when it drops so that once it starts rallying up in price you will be in massive profit.