You can split your investment into 2 even if your 1st coin investment will fall you have 2nd option while waiting your 1st investmen going high your 2nd option makes you win the game.
That's why you must diversify your portfolio in at least 2 or more coins so when things messed up you still have something to rely on.
On the other hand, waiting isn't always a good thing to do as it can spoil what's meant to biy and don't wait too long as ypu didn't lnow you already miss the ride.