instead of just new projects, but sometimes there are old projects that have not yet entered the popular market, for example like easyfeadbeck they have made sales at tokpie and almost 1 year more have not yet entered the popular market as well, even though their project is in my opinion an active project
The projects like them may get listed but the point is that every project needs a product to rely on and to develop it further. If that is being underdeveloped or neglected by their devs for whatever reason the project will not get enough marketing. Demand does not generate completely on its own even by the investors. There needs to be an organic growth of new investors because of the market of that product. Most projects failed to develop that market.
There is also the problem of some exchanges predating on coin offerings and asking them huge listing fees. This is a side effect of crypto not being regulated. But that can be prevented if you just stick to bitcoin and the top altcoins.