My wallet is still in Shelly era, and my current need is only hold. Does holding on old era wallets affect safety, security,.. or something to the holding process ?
Short: No.
Long: All wallets are still somehow in Shelley era. None of the protocol upgrades since then changed the address format and derivation as the Byron to Shelley upgrade did.
They just added functionality on top of Shelley wallets.
All wallet apps more or less support all those new functionalities. You can just use them with your Shelley wallet without migrating anything. For example, if you are staking, you might want to also delegate voting power to a dRep because that is necessary to withdraw (but not to earn) rewards.
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