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
Every coins has same change to survive, you're right but I believe every coins solve something and that's why developer launch it as a project. Old strategy is only trading and investing use bitcoin, this is psychology trends leader will stay on top. Unfortunately I already leave crypto market, so I can't use your method but I'll use it next year.