Make separate physical wallets and separate the coins among them
Make backup of them just in case
And put them where no one would ever think such thing would be found, like among old books or among useless paper
this is what i will do if i have > 100 bitcoin and i will use the offline wallet, and for online wallet, maybe i will only two or three wallet and i will use cold wallet too as i want to keep the most of my bitcoin and for the other wallet, maybe i will make separate in each of 5-10 bitcoin in 10 wallets.