I say YES for quality ALTs with working teams and good vision. I think Cardano, Stellar are a couple of good ones!
What do you think?
In addition, I think you need to hold for a couple of years!
Maybe on that kind of altcoins you mention its have some potential of it from the future must better to hold it for a long time if we want to earn more profit the altcoins we hold. Actually there are so many potential altcoins that we need to buy or hold for a long time but we need to time and search for them on which altcoins it is.