Its impossible to have one or two coins in crypto space because one or two coins can't solve all the problems we have in this world in every aspect of technology or others, if you want to keep a coin for a long time make sure the coin or token solves one or two problems in crypto space or the world, this type of coins don't die easily because they have real use cases, its simple as that
Coins that are suitable for long-term investment are those that already have a product. By owning a product, a coin or token will continue to be traded in the market, especially if the project is able to make a profit, I think investors will continue to hunt for the token or coin and expect profits from the company.