The reason why there is so much interest in popular cryptocurrencies is because they have been tested and trusted and you know they won't rug you, most of these new tokens you don't know them, especially their developers because most of them are anonymous, so the risk of them scamming you is huge, but a project that has delivered part of its roadmap, you know the technical capacity of the team and if they will deliver or not
This is the basic concept behind the success of popular crypto coins, people can easily trust bitcoin but if they wants to invest in old coins then they will hesitate to put money or not. People saw the success of bitcoin so now they can trust it blindly but it does not make a sense that without knowing about it you will be a successful person.
Most of the new projects are just for money nothing else so it cannot give you profit but longer term investment in Bitcoin can make you proud for your decision. Reading about project manager can be a helpful source to decide what to do and also remember that if project manager is unknown and also the coin is new to you then instead of putting your money into risk give a check to the token and then choose to buy or not.