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Just make sure that the metal you use has a high enough melting point.

Tungsten, perhaps.

Do people usually find big pools of metal on the ground in burned houses, or is everyday metal fine?

Especially inside a fireproof safe.

Wouldn't trust aluminium, solder, Wood's metal, gallium, or mercury, but apart from that...

Maybe a clay tablet (assuming it's safe from water)?

Additionally hardware wallets which can use a seed to generate huge variety of keys.

Including AGE keys (so you can encrypt arbitrary data), SSH keys, FIDO2 and passkeys.

Additionally you might want to store a hardware wallet in a deposit box instead of the seed (if you trust the security model).

And so we return to our programming-roots with punchcards. :p

Articles such as https://blog.lopp.net/metal-bitcoin-seed-storage-stress-test... will help you pick among the various seed stores out there.