You can use the offline wallet that we know by the name of ledger nano, with it you can safely store all your assets offline, provided you can not remove it, or destroy it, because if it happens then all your digital assets will vanish. But the positive part you will be much safer than hacker attacks
I think offline and online wallets have their own advantages and disadvantages, in my opinion the important thing is to save the private key, not to be known by others. if I use my wallet wisely in my opinion it will be safe and fine.