You'll need a soft or hard wallet, a backup method appropriate to that wallet, a safe, custodial access (some way for your family/friends/etc to get to it if yo

You'll need a soft or hard wallet, a backup method appropriate to that wallet, a safe, custodial access (some way for your family/friends/etc to get to it if you die) and you may need to run a bittorrent node. Most soft wallets are built in electron (Metamask) and are exactly as secure as you think an electron app is. Hardware wallets are in theory better but may be vulnerable if physically taken, and require a cold wallet which itself has to be kept securely and for extended periods of time. For $120 you can get a titanium card to store your cold wallet backup on. And all those hard/cold wallets need physical access control, protection from fires, etc.