Yes, in trading it is better to use different markets, strategies and timeframes for diversification. It is good especially when you have a deposit allowing to do this. For each market you need a part of your deposit. As you add more markets, the trade volume should decrease for every market. With less markets, a higher volume can be set for each trade.
You can have a larger account trading many pairs at the same time, and smaller accounts trading just one pair (with higher trade size, as per our settings)