Self-custody has no bank reset. Your heirs need the seed eventually and must not have it while you are fine. Leave the secret with instructions they can follow.
Leave the seed phrase or recovery material as an encrypted vault item. In a separate note, explain which assets exist, which hardware wallet or app to use, whether a password (25th word) is required, and who to call for technical help. A seed alone without steps fails for non-technical heirs.
Wills can become public in probate and are the wrong place for spendable keys. Legal documents can say that digital assets exist and who should receive value. Recovery secrets belong in a controlled leave-and-claim path.
Say that the phrase must never be typed into a website that offers to help. Name the wallet software. Note approximate holdings so they know the work matters. Warn that anyone offering recovery help is usually trying to steal funds.
Assign the crypto file to the right contact. Use practice claim so they see how claim works with sample content. Real release still waits for missed check-ins and the waiting period, which you can stop with a single check-in.