How exactly do altcoins gain value? There are so many altcoins out there and honestly you can see connection among these in terms of the drop and rise of price.
Some of altcoin depends on bitcoin and some of it is independent to btc, it's eth. Altcoins value was gain through users and developers, the rise of the price value is affected when the flow or circulation of the supply is good. Holding is also the key that's why community also affects this. Having a good community and communication, it can make a value to the altcoin.