How to keep your seed phrase properly : Write it down in a note , and keep it in safe place (safe from physical attack like water , fire etc) . And put it in a place you can easily remember or access, so that you won’t forget where you put it , because if you lose it you won’t able get it back .
Unless you're being targeted by people that already know you're into crypto so they're coming for your money in both fiats and crypto, unless you're being targeted by those then you don't have problems with storing your seed phrase on paper. Laminating it is another securities that helps to avoid damage from flood. You can lock the seed phrase in your vault, you should have a secret vault where you keep your valuable information. Storing them online is the worst thing you can do. No matter how careful you think you're, anything that's connected to the internet is just one mistake away from getting into the wrong hands.