Even if you invest coins with potential projects, coins will never change, they will fall, all need deeper research and at least every investor must have a basic understanding of technical and fundamental analysis.

Because the goal of investing is to get profits in the long term, in the end, developers are smarter than investors to manipulate the projects they create, especially in market situations. Each coin has a phase to grow but if their product development doesn't increase as well, only time will erase their existence. Think about your type of investment for the long term.