Here anyone can suggest you anycoin that is profitable in his view but here every coin whether is altcoin or Bitcoin has no particular definite amount of the price to increase or down , or we may say that no one can predict that whether a particular coin may rise or down with the time .
So I will recommend you to invest more than one coin or even multiple coins because in the market of the cryptocurrency Thier is always net get in the investment of money so net gain in the profit .
So if you will invest in multiple coins than the chances of loss in the particular coin case will get minimise and you can easily make profit .
And also you should take care that never get wondering that whether price will increase or not always remain full of confidence that you will get profit surely .