While it's ironic, self-custody is hard. If thieves were determined to break into my house, could they do it? Probably. Would my safe be enough to keep them at bay? I really don't know.
the question is do they know crypto?
maybe the thieves don't know before seeing the bitcoin sticker sticking front cupboard, and after seeing the bitcoin sticker they tried to find the private key in your safe. What I mean is as long as they don't know what you're keeping, you will okay.
If the thief is not someone who knows bitcoin and crypto they probably won't know what you are holding, but if the thief knows about bitcoin I think when they see the private key or phrase they will know it is what. Any method will have certain risks but I prefer to keep it at home rather than hand it over to a 3rd party like a bank. The same method, I will keep it all in my safe at home and I will use some more tricks like maybe swap a few places of phrase or private keys and we just need to remember those that change. If unfortunately we lose the seed phrase, the thief will not be able to access our property.