First rule to invest is you need to do technical analysis, and second is only to invest what you can afford to lose to minimize the risk of losing a lot of money as cryptocurrency is a high risk high return investment.

That is my suggestion for investing.

Next, if you ask me what good ICO for a long term investment, the last ICO i have met is VLB. The project and their member is at great level, but i guess this is a long running project because it can not be executed in a short time, as they already mentioned it on their timeline in their whitepaper. You can look at them for yourself at https://vlb.io/