If for long-term investment, fundamental analysis is needed to see the potential of the project. Do not make other people's opinions as to the main assessment, you must have an independent analysis in order to really have a solid foundation to support the project. You also have to understand the current trend in the market, for example, at the moment the Defi project is highly favored.
All things have risks, the size depends on our readiness to reduce these risks. Mental must also be strong, if we are ready to profit, we must also be prepared to lose.