We have a new project that provides Wallet for cryptocurrency, but we are not sure whether users will need multiple Wallets to manage their coins, that's why I am starting this poll, please help~

I'm a trader so I really need a wallet that supports multiple coins. It's better to keep my coins offline because I can't assure that exchanges can secure it 24/7 because there is still the possibility of a hacking incident. I hope it works fine just like electrum.