...However, like OP, who wants to take a loan at a high interest rate, it will never be safe for him, no matter how expert he is in trading. One should always trade with his own money or invest in a high volatile asset....
The only obvious thing is that the OP is not an expert in trading. Otherwise, he would have enough capital so that there would be no desire to borrow at such a high interest rate. And since he has not been able to make money trading before, it can be assumed that he will also lose the money he will borrow.
That's the reason why its so risky to try those plans he want to make since by taking lose it double down the risk especially that the need to pay the interest plus what he plan to do is not giving any assurance that he's so sure to get a profit from it.
This is why its better not to borrow money if they are just planning to trade their bitcoin.
But if they are for holding their bitcoin and more plan to add more volume in their portfolio then deciding to borrow money is not actually wrong in that case.