I consider investors and holders as the same type. Long term traders are completely different from the two. If you want to be an investor, you can simply hold the assets or crypto that you have bought. Whereas being a long term trader, you can speak for the futures with this and as you trade it's a decision to do long or short. That's my understanding with the long term traders because if you only say long term, then all of the three are the same with removed word of "trader".