I'd say you invest a large percentage of it, say 70%, into that project and the remaining 30% into active trading to make some short term profits.
Secondly, it's too risky to put all your eggs in one basket. It's very easy to lose all in the case
Since it's a long term project I would rather give it a 40% investment while I trade with the remaining 60%. Chances are, if I'm focused and that good at trading, I'll probably double my capital in no time and now I'll have more funds to invest in the project. The initial investment was just incase the coins skyrocket so I won't be left out of the party.
Now if when you want invest, the coin has risen to some incredible price then you'll just have to wait for a correction, it might not fall to your initial buying price but at least it'll give you an opportunity to enter the trade and don't forget you're in for long term so the profits will always be certain provided you made the right selection of coins.