From Xu Jiayin and Wang Xingxing, I’ve realized an investment lesson. Xu Jiayin is like an ST stock or a delisted old altcoin, while Wang Xingxing is like a newly launched quality altcoin. Clinging to an old altcoin with no future is like waiting for Xu Jiayin to make a comeback—extremely unlikely. Selling the old altcoin and investing in a new quality altcoin is your only chance to break even.