Just wait, it'll come back up 😂

Marrying a second wife, my spouse and I contributed 500 million to invest in Altcoin. Each month I accumulate a little, at its peak it reached nearly 800 million but I didn't take profits, now my assets have dropped back to only 300 million. It has left without a word of farewell. In fact, it has even gone into the capital.

What should I do now?

Should I cash out to USDT and wait for a downtrend before investing again, or should I still hold the current $ETH altcoins? Thank you all.