When set index move to 620 or 450.

Can stop at 650 point of set index bearish?

When value of blue chip stock in the thai market redude more 20-30% .

Now thai set index is very low. Price of some stock lower than book value in fact. Set can rebound in the all time. Short term can rebound but long term still bearish market so that you can select trade at high divident stcok such bank or change to Gold, AFET market.
Future market will be have usefull in this time. You can short future for bearish market which help reduce loss money from bearish market or in case you don't want to sell stock because you buy at high price. Do you know stop loss?