Guys have few half bitcoin i earned through promoting projects and i am looking for a way to increase this btc, i am thinking of using USDT to lock my btc when bitcoin reach 9,000 plus and buy back when it drop back to 8000 plus, is this possible or just a stupid idea over all?
It's trading strategy, shorting, you sell high and you buy back when price drops. It works in some moments, after all every price rise has top, like every drop has a bottom, catching top and bottom is not always possible, but with monitoring the market carefully you can maximize your chances for successful trades.
It's not a stupid idea, every coin has a volatile price, so every coin has some range of that volatility. Except sudden increases and decreases, which often happens in crypto market, price tend to keep some range for some time. Spotting this ranges on time will help you to determine where are tops and bottoms, and you can adjust your orders by that.