I think there are no stable altcoins in the market because just like bitcoin its market value always fluctuates in the market. The price they have is very unpredictable to deteremined so no one knows when it will increases or decreases.
Correct. If coins are stable we cannot earn profit, only the volatile situation in crypto market makes trading better and this is applicable to any market including the share market where currency is fluctuated. You can figure out some potential coins which will bounce back after dip or have good growth potential rather than searching for stabilized coin which don't make any sense in trading business.