Most of the answers I have read from the Op question, have not answered it. Though some are good. Op asked a simple question which is in the below quote.

and I don't think there is such wallet does exist, we are talking about one wallet hodling different cryptocurrency inside. I think it is not possible. All the projects (coins) has their own wallet to hodle their coin. And if Op is looking for a wallet that he can use to hold or store his coin on a desktop computer, then, it would be a wallet like "Trustwallet" because in Trustwallet there are different wallet addresses which one can use to store different cryptos but even at that the coin can't be stored in one wallet but in separate wallets. Therefore I don't know where one wallet can be used to store different cryptos.