Recently lost 100,000, which was also someone I met online. They asked me to buy spot flash exchange, and started teaching me how to use U flash exchange coins, making a few hundred or dozens every day. Later, they told me to buy 15,000 U to prepare for a bull market, and to use my U to exchange for the FEl coins they sent me for flash exchange, saying it would rise every day. Initially, I could see the increase, and could exchange it back to U. However, since I bought 15,000 U and exchanged it for FEl, it hasn't risen anymore and I can't exchange it back to U. Can any kind friends in the circle help me with some advice to recover my losses? The other party hasn't replied to me for five days, and I can only seek help.