The simplest option is transferring the coins on that wallet seed phrase to a new wallet, this way even if the seed phrase is detected it will be useless to the person in its possession.
It's not totally useless because it contains your transaction history and you might want it not fall into other's hands. Also there could be situations where it's not an option - you want to destroy just a backup, not the wallet. Imagine you have two backups, one at your current location and another at a remote and safe location. Let's say you are moving from your current location to some new one where you wouldn't keep your steel backup with you because the new place is not safe enough. So you'd want to destroy the backup at your current location, while still relying on the backup at your other safe location.
Your wallet transaction history can be traced regardless of which wallet it is in, because the blockchain itself is a public ledger. If you are that worried about your transaction history you can always swap your Bitcoin for Monero and them send them between a couple of other Monero wallets and switch back to Bitcoin. You can do this with in a non custodial way or you can trade the coins on a CEX. And nobody will be able to trace your new wallet to your old wallet. But destroying the hardware itself seems pointless.