Should I transfer my cash (around 2k) from STI ETF (at a loss) to buy up stocks which are at a bargain price now?

Yupe, is like opportunity cost.

If you see that other stocks will have a better recovery than STI, then go ahead to make the switch.

No need to think so much
I make videos about interesting stuff at youtube here​​​

Newsflash, everywhere (even traditonal safe havens such as gold, jpy) is underperforming, STI is not the sole orphan in this equity meltdown.

Since the bulk of your STI investment (alr in the red) in absolute amounts is not high, it made not much sense to realized your loss permanently, might as well let it be. In times of black swan events, sometimes its best to learn how to comparmentalize the spilled milk away.

I would rather focus on building a new warchest and prudently deployed them over a one-year period on your shortlisted companies while being aware that lower lows is highly probable in the short-mid term horizon​​​