Long term It would be good to think of something else. Because I think finding the best altcoin in advance is not an easy task. There is a lot of altcoin in the market and a lot of new altcoin is being added every day so you have to do a lot of research to find out which will be good for you. If you have already bought Bitcoin, then it may be a good decision to hold Bitcoins without worrying about altcoin.