LTC price now reduces a lot and you see that the price now is good to buy but you can wait for another correction that can come.
Monero is the other profitable coin because this coin has not increased so high before, so I guess this coin still has a chance to rise again.
I prefer to buy Monero besides Zcash but Zcash is another option to buy if you want to hold it for the long term.
But you should have bitcoin for the investment because bitcoin will have more chances to increase so high than the altcoin. The altcoin will be good be a short-term investment.