There is no particular time that is best for trading, and you can’t know when there are lots of traders online, because the time in my location is not the same time in your location. And if you’re showed how many people are online, you will still come back to ask what actions they are taking at the moment, whether buying or selling. I have several exchanges, forex to be specific, show what orders the expert traders are making and you’re allowed to follow the same, but that doesn’t you will cause the so called experts will also make mistake.