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it's not much use now, but to basically avoid the entire issue just use whole disk encryption the next time. Then it's basically pre-wiped as soon as you "lose" the encryption key. Then simply deleting the partition table will present the disk as empty and there's no chance of recovering any prior content.
Does one have to supply the password at each boot with what you are describing - this sounds like the password is somewhere in the partition table. If so what do I google to learn more?
There are many ways to setups full disk encryption on Linux, but the most common all involve LUKS. Providing a password at mount (during boot, for a root partition or perhaps later for a "data" volume) is a but more secure and more frequently done, but you can also use things like smart cards (like a Yubikey) or a keyfile (basically a file as the password rather than typed in) to decrypt.
So, to actually answer your question, if you dont want to type passwords and are okay with the security implementations of storing the key with/near the system, putting a keyfile on removable storage that normally stays plugged in but can be removed to secure your disks is a common compromise. Here's an approachable article about it.
Search terms: "luks", " keyfile", "evil maid"