i think when you have already bought btc at 19k$ then at this moment the price of bitcoin would be too low now for you to sell, then i suggest you should leave them and start buying some new bitcoin, begin trading with your new bitcoin with your own money, believe me, bitcoin will surely rise more than 19k$ in the future.
What the hell?
OP said he invested $57K, no, he said he took a credit and bough bitcoins, he has lost half of money(if he sells) or $28K and you suggested him to buy more bitcoins?
No, he should only hold and not buy more because he has invested more than he can afford to lose.