Liquidity is definitely key.
That's what happens with random coin investments, if you buy in the hype then there will be no one to sell to later on.
I would also document other criteria such as number of exchanges where the asset is tradable, when to close a position, i.e. when it reached X % up or X % down? It's easier to sell when it's going down but up much harder, you can become greedy and so on... Therefore it's good to have these rules set to maintain discipline.
Good tips!
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