Well treat your Ether as Money or investment in a Stock. And Ether is going to do well and has very high chances of doing great in the next 5 years.
In my opinion i would suggest even if you are looking to invest in ICOs, your objective is to outsmart the growth in Ethereum, only then it makes sense right. Sometimes you are better off doing nothing and sometimes its the other way.
I suggest you keep 500 Ether as is, and do not invest anywhere else and just hold them for the next few years, they may one day be sufficient for you to by yourself a new house.
The other 500 Ether you bucket into 20 blocks of 25 Ether each, and over time look at alternate investments and ICOs, with each ICO you put in max of 25 Ether, so even if you pick a not so good one, your risk is limited. Apart from ICOs you could also put the 25 ETH into already listed Alt coin which are trading below ICO price after doing your research.
As for Enjin ICO, its a good one within the gaming space. And with the defined rate hike thru the ICO entering in the 1st week would be a good idea.
All the best with your investments!
I recently graduated college and my father gave my brother and I 1000 Ethereum as a graduation gift. He told us to hold onto it for the next few years as an investment. My brother keeps telling me about ICO's, and he has recommended Enjin and Airtoken. I'm wondering if I should hold or invest in these upcoming ICOs. Any information will help.