when u have a look at the altcoin markets u will see that nearly all altcoins are close to there bottom.... so u can pick up several cheap coins these days/weeks....
But if you invest right now exchanging bitcoin for the alts, sure you getting more alts but you are also throwing away bitcoin in its highest fiat value ever. So why not sell bitcoin for fiat, wait for it to take a dip, rebuy bitcoin and then invest in alts.