Holding some popular coins in your wallet to invest in a long time I think is a good decision. But, we still need to observe market developments and when you see prices rising high, I think selling them at that time and not being too greedy to keep holding them is the right decision.
I personally also made several investments in coins that have high fame in this regard, I am not looking for high profits. investment goes if I get a profit then I will sell then wait for the price to go down then start investing again, I do it in a careful way