I'm late to post here, but here I am anyways.

It's important to understand your seed phrase (aka mnemonic phrase) is your bitcoin. If you have a zillion $ of bitcoin that piece of paper is worth a zillion $. Lose the piece of paper, lose a zillion $. I steal your piece of paper, I steal a zillion $.

I'm not sure in how bad a shape your old dying laptop is. Bit if it's not in too bad a shape, I would save the seed phrase somewhere safe and use the laptop as a hardware wallet. You just turn it off, and don't let it connect to anything. Done, your coin is almost 100% safe....unless I getbmy hands on your laptop or piece of paper.

Some purists here will interject and say that what I just told you is not safe. It is safe. Relative to what you were doing, it's a great deal safer if you do what I just advised.

If you really want to get very safe, write your words on steal instead of paper, and bury it somewhere in your backyard.