Hold bitcoin if you eye for long term goals. That's it.

If you want to diversify your earnings, you need to face the risks of investing on other altcoins. What coins should be considered here? It's up to you to make a research so that no one could be blame if someone told you to invest on "this" coins. Where you can profit more? Again up to you because your profit will depend on your strategy and not our strategy. I suggest that gather basic knowledge first before engaging in actual trades so that you really know what you are doing.