If you believe the price will be lower, you can sell it ,and then buy it in a lower price. However if you believe the price will be higher after a while ,just hold it. The most important thing is make good research of the alts before you buy, do not buy trash alts.
it is not a game of believes it is game of graph reading and situations under which bitcoin price will affected, so try not to believe just use our knowledge and experience to predict the prices and then take decisions..