First of all i have to admit that i am not any of these 6 coins that you have listed because i mainly invest into new and small projects but of of course i know all 6 of those projects. Personally i would probably not sell any of those coins at the moment except i would really need to sell them in order to pay my bills or stuff like that, but if i would have to chose from these 6 then i would go for Cardano and Polkadot.
Cardano because it already saw it's pump after it introduced it's smart contract functionality and now it seems to get quiet around cardano again and Polkadot because it is inflationary, it keeps producing new tokens and the total supply will continue to grow. I still think that hose 2 projects are good but i had to choose two of them.