If in trading apply fast trading strategy,
What obstacles are constraints
and weaknesses?
How your strategy will work out. When the market is in red, how would you go about selling much faster. Its ok to buy much faster as the values of every coin is less, but how can you gain profits much faster when the prices are very low. I just read through few trading stretegy. Buy when the coins values are low and sell when coin's value crosses the value you bought even 10 percent. This would help you see a good return.
You forget that today you can sell as easily as buy. Many crypto exchanges today allow selling borrowed coins. Selling borrowed funds with an expectation of future price fall is called shorting, while the whole process is called margin trading. In this way, we could rightfully reverse the thread title, and then it would read sell fast and buy back fast. When shorting, selling fast and buying back as fast is the only option as shorts are very dangerous. They can easily wipe your account balance clean with one sharp move of the price.