Such a big profit? What kind of brain do you have to believe that?

This is really a headache, on one side is my big brother whom I've followed for more than a year. Although I haven't made any money from any projects with him in this year, I've still been with him for over a year. On the other side is all my wealth, what should I do......
The incident began on April 30, when he introduced me to a USDT arbitrage project that had been running for a year and was very stable. He also sent me his earnings from arbitraging. At first, I was worried that this might get frozen by the exchange, but seeing him make profit after profit, I was successfully brainwashed. In the evening, after resolving my Ethereum position, I invested all of my remaining 4300u into this so-called USDT arbitrage APP. The customer service said I had to wait two hours to start arbitraging. Around 11:30 PM, I began my first arbitrage, but it was unsuccessful. The second, the third time, until I couldn't access the app, I finally felt fear. I asked him what was going on, and he said it had run away. I thought he was joking with me, I couldn't believe I could be this unlucky. He had been fine all day, and the moment I joined, it ran away. Until the next day, he gave me the DingTalk number of the project party, and I asked the project party for a new link, but once I got in, I couldn't withdraw my u. It prompted that it was frozen, stating that I had to complete one transaction before I could withdraw. I suddenly realized that this was not running away, but it was a complete trap, a big scam!