Don't buy any crowdfunding coins randomly, and don't go all in. You must have a stop-profit and stop-loss when making strategies.

 
Ignoring positions, stop-profits, stop-losses, and deposits and withdrawals based on the contract win rate is just cheating. In other words, even if your win rate is 99%, you may not necessarily make money, and conversely, even if your win rate is 20%, you may not necessarily lose money.
 
For example, in this wave of crash, you shorted from 70,000 to 50,000, with a 100% winning rate. Then your positions were basically the same every time. Your principal increased from 10,000 to 100,000, a 10-fold increase.
 
If you have increased your position 10 times at this time and you cash out, then congratulations, you have really made a profit, but what about the vast majority?
 
Most people are greedy and want to double their 100,000 U to 1,000,000 U. However, Bitcoin did not do as you wish but rebounded from 50,000 U to 60,000 US dollars. You had no choice but to short it at 50,000 again, and then increase your position to go all-in at 55,000. Finally, you had no room to cover your position, and when it rose to 62,000, it exploded. Not only did you lose all your profits, but you also lost your principal.