If you are talking about the newly launch  project in the market and those just coming soon, it's really difficult to know whether it's a good project and can be successful in the future. You need to be wise and always check the team behind the project, the community that support them and the project itself, if it was good to invest or not.

You can also find a good project in the market which is already had strong foundation like BTC and ETH which  I think you will not regret if you are going to invest on it and hold for a long term.