Write it down on paper (or engrave it on a metal NFT if you're fancy) and hide it where even your cat won’t find it.
What the heck is metal NFT?

I know about stainless steel backup, but I never heard about metal NFT.
4️⃣ Split & Secure.
Break your seed phrase into parts and keep them in different places. One piece alone won’t crack the whole puzzle.
This is a terrible advice, especially if you are breaking seed words in your own ''special I know better'' way, many people lost coins by acting ''smart'' like this.
Only way to split seed words in proper way is by doing Shamir Secret Sharing aka SLIP39, or with multisig setuo.
“Split & Secure” means storing seed parts separately. Advanced users can use SLIP39 or multisig; others can split halves.