Trading US stocks for two months, from a 20% drop to a 5% profit, thanks to my persistence and not frequently changing stocks.

Heavily invested in SanDisk and Micron, added more SanDisk at high levels, went from a 10% gain to a 20% drop, but luckily I held on and resisted the bearish comments from some people online, ending up with a 5% profit.

Unlike A-shares, where I was heavily invested in Zhongji Innolight, Eoptolink, and TFC Optical Communication, and a month ago, people online kept bearishly saying it had already gone up tenfold and was at a century-high peak. I couldn't hold on, sold at a loss, and suffered big losses. Zhongji Innolight surged 13% three days after I sold it at 454 on November 24, missing out on a 36% gain—so frustrating.

In A-shares, if you don't sell when you're up, it'll drop hard. I often hold onto stocks after making a profit until they turn into losses. Constantly switching stocks and chasing highs and cutting losses leads to huge losses.