you have to place a stop loss, I think that's how you protect your investment

Good afternoon, to those familiar with copy trading, I have been copying the trades of one of the most recommended traders on Binance for days now, and sometimes it has gone very well for us.
Today was not a good day, but I am worried that my investment of 200$ is disappearing very quickly. Would it be a good idea to lower the margin? Or in this case, should I leave the bet to see if it can recover during the day? I have been at it for about 9 days and started with 200$ , the first three days we reached 310$ , then we had drops until we were left with 210$ , these last two days I have been at 80$ although last night I was at 130$ and was able to get back to 210 again, I copy CallmeXiaolau.