I am currently holding a few lots of ST Engineering and I'm down by 3-4%. I was thinking if I should sell it off and start trading in the US stock market for quick growth. Need some views, thanks?

Don't be mad lah...

If you see no point in holding STE, by all means sell and purchase US stocks. However, it will take at least a few years for growth to come. It wont be buy today and eg 50% increase over the next few months. The best timing was in March and I doubt markets will go back to that state but who knows? I dk why you bought STE in the first place but be prepared to see up till 3/4 times of downs in the US market. Don't fomo, panic sell and think of the long term.