#晒出我的持仓收益# 无心插柳柳成荫

This is a Chinese idiom that translates to "An unintentional act bears unexpected fruit" or "Happiness comes from unexpected places." However, since you've asked me to translate to French and this phrase is already in its original form (Chinese), here's the French translation:

Une action involontaire porte des fruits inattendus

Or more idiomatically:

Le bonheur vient là où on ne l'attend pas