Other than a complete dump of your altcoin, why not share your portfolio amongst the two either Bitcoin and other coin so you don't miss on both opportunity.
This is what i do, i personally did not jump early onto the bitcoin project so i am not one of the top gainers from btc. So in order not be a latecomer to some other promising altcoins backed by good projects, i have identified them and have a percentage investment in them. Not so many though, so i can keep track. Also, regardless of the fact that btc has good ROI, i consider investing in it alone as "putting all your eggs in one basket".