You are in crypto currency Field where nothing is sure and definite , we can say it is unpredictable .
So here different person will suggest different different coins , so I don't think that it is better to take advice of everyone because you can't follow everyone at single time , so mine suggestion for you to analyse yourself about such things to handle perfect timing .
But still I would like to give you coins under value of 1$  , that are having chances to make profit by hold them for few months .
Sia coin , BCN , pak coin , blry , creva , posw , digibyte coin , reddcoin etc  are better for long term as well as short term investment .
Here I am not giving any gaurrenty that it will reach to 50$ but I am giving you a gaurrenty that your profit will be sure for this coin .