if you are buy new project you can't predict about future.
but if you are buying on going project of complete project, you can find project are good.
because in this situation that project are survive.
like ETH, or LOKI, loki has come back from under 2k sat to 6k sat for now.
I think they will grow up more.
Whether it is a new project or an ongoing project or possible one that has not even started at all, what is important is to at least get to understand that in every light, you are at least sure of the potential of the project in the long run. It is not really about how long the coin or token has been in the market, it is all about the value and business solution it actually creates as this is what would give it huge support as well as sustainable demand based on real life usage in the long run. One thing certainly a lot of people normally do not understand.
GVT - the platform launch is a week away, easy gains this week. If you like what you read about the platform in the meantime, let the tokens ride. Or sell the launch, its up to you.
You are literally suggesting to go for gambling. In my opinion which is not at all a right thing to do in open discussion because it may trap many innocent people here which eventually just due to some random responses like you just did. OP is asking for life changing long term perspective coins, then we must suggest only highly reputed things.