So, when will be the better time for trading? (using KLSE volume)
So, where's the sign? The volume speak for itself. The volume itself is a major part of technical reading. You just can't ignore volume.
For a more suitable environment for active short-term trading, I suggest rather wait for the volume's 21-D moving average (red) to at least hooked-up or better, to crossed over the 50-day moving average indicator (as like labeled X : see the chart below : recent the moving average interplay plotted to show how volume can give bullish signal for KLSE index)
I believe the volume's 21-day & 50-day moving average are good for checking "is-it-a-bullish-environment?" signal but not for bearish signal (way too late). For bearish signal, try looking for volume-based indicator's divergence. As an example, Money Flow Index also plotted on the chart: how the indicators' divergence can give in-advance bearish signal)
Below: KLSE Volume Chart (click the image for a larger view)