this fund mainly buys the Shanghai stock exchange ETF, and this ETF passively copies the Shanghai stock exchange index.

It depends on your investment plan and affordability. If your money is temporarily idle, keep it. Anyway, the market is already at a very low point, and it can't be worse. When the large-cap stocks in the market rise, your fund will also rise. But if you can't bear the loss it has given you now, you are willing to admit defeat, sell it, and leave the bag in peace.

I suggest you study the index of Shanghai Stock Exchange's oversold market. If you think it has risen in the market, wait. On the contrary, sell it.