I don't think all new projects are bad, but in fact there are indeed many new projects that are only listed for a moment and die, this is due to the lack of long-term utility of the coin, or is considered less attractive to investors. but there are also some new projects that can last a long time, so do more in-depth research on the project you want to invest in
Reason many new project are not worth to be invested into is because they're just copying already existing project and only created to benefit from the hype of the moment. This usually happens when new trends get introduced to the market.
When investing in new projects we just have to do our research very well so we don't fall to scams as we have many of them in the market. Always make sure you research on the teams before you invest to avoid getting scammed.
Also before investing make sure you look at the token distribution to understand the tokenomics of the project. Understanding the tokenomics will give you an idea how high the project can pump so you know if it's worth investing.