I would advise to invest in coins and tokens that you can personally believe in and, if possible, have knowledge in the particular field.
Since you are interested in long term investment you can't go wrong with the big ones like bitcoin and ethereum, although investing in them now is a bit risky since they are really volatile right now.
But the best solution would be to diversify and split a small portion of your funds onto ICO's. Especially ICO's that feature coins that aim to be a more stable and less volatile one. You can look in my signartur if you are intrested in a token that aims to be a long term investment with a real asset behind it.
Since you are interested in long term investment you can't go wrong with the big ones like bitcoin and ethereum, although investing in them now is a bit risky since they are really volatile right now.
But the best solution would be to diversify and split a small portion of your funds onto ICO's. Especially ICO's that feature coins that aim to be a more stable and less volatile one. You can look in my signartur if you are intrested in a token that aims to be a long term investment with a real asset behind it.