when to sell? Of course it's very easy, because traders must also have the skills to sell at the right time,
and definitely don't be greedy, if you have experienced an increase of 10% I think it's the right time to sell.
10% profit is good enough to close position. Generally I close my trade after getting 5-10% profit. I always use stop loss also. For traders, they have the ability to know when to sell for gaining profit.