Long-term investment, of course, means that we will retain the coin for a long time, and the coin we choose must be both secure and non-destructive.
These are the top coins on the Coinmarketcap list that I selected; Bitcoin, Ethereum, and BNB are the most viable Cryptocurrency currencies, and are safe to invest in over time. What's more, these three coins have a potential value that will be determined in the future.
That is indeed a very common choice by everyone from the past to the present, but I am a little different from you where I only choose Ethereum, BNB and Cardano for the long term, although I have a target time that is not so long, but I have set it for the long term although I will release it when my target has been reached on all three coins.