You have chosen good coins. even if they start to fall in price - do not panic. Go have tea and walk outside. Nothing urgent need to sell. You have stable coins, they will always be in price. Come back to this in a month and see how they grew up.
Yes some of coins are worth to hold because there value little by little become higher so they really worth it. I suggest to you to choose the best coin and have potential so that you when you hold it you will never regret to hold it. Also holding is the one of the good way to grow your coins when there's a price falling, just hold and wait to rise the value.