Price of a coin is important if you are holding coin for sometime but for trading it is not important even in a red market. The best strategy in your case should be money management skills. It depends on how much money you afford to loose. Always put 10% of your savings or your spare savings which will not trouble your routine. Then you are safe. Your skill & practice for trading is the main fact to get a profit from a trading. If you have good source of news, inside information of particular coins, Market movements & patience. you are almost done & always try to book small profits as end of the day it will give you some smart amount of money just by being patience.