It seems to me that trading is a very risky business even with small amounts of coins. If you want to trade then use the fiat currencies. They are more stable and predictable. It is worth to invest in cryptocurrency. That’s true way.
Holding and selling bitcoin depends on the situation, if the value of the bitcoin is high then i sell it but if it is to low it's depends on the situation. What if I need that bitcoin to support my daily needs? then there's no reason I hold it, im still sell my bitcoin even in a low value to support of my daily needs and to my family.