::
The method I recommend is to split the seed using Shamir Sharing Secret. You can use any arbitrary n of m combination. 3 of 5 & 5 of 7 are two common choices. Adding a strong passphrase you store separately is a good option.
Make sure when to generate the secret, you do it from a air-gapped computer (not connected to Internet) from a live Ubuntu USB.
https://github.com/iancoleman/shamir39