As I've stated in my most recent post it's imperative to read the whitepaper and be constantly involved and actively seeking updates from devs on whatever token/coin you're interested in or at the very least you believe will succeed. This alone should be the guide for your buy/sell points and how you invest/trade in general.
Ask yourself this simple question before you make a buy/trade: is this buy/investment in a service/good that you personally would buy/use?
If the answer is yes, than have faith in your investment and the future of your portfolio. If the answer is no; than you're a dumbass plain & simple!
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