I see STA rebounded a bit today. You should get a trailing stop in behind that.
Also have a look at the five year graph of STA with bollinger bands in place. The lower band is circa 11 baht.
Do you think PTTGC is starting to look a bit overpriced?
I see you are holding mostly blue chips. Have you thought about just holding an ETF like 1DIV or BMSCITH as a low maintenance way to diversify your investment.