I would like to see some thoughts. Thanks.
The answer is pretty simple. Electrum cold storage.
1. Put Electrum on an USB stick. Then copy the seed and the private keys to a sheet.
2. Repeat this process as many times as you want. You may put electrum on 3-4 different sticks and write seed and private keys on different sheets as well.
3. Memorize the seed in your mind.
4. Give the sheet with a seed on to a trusted person (if know one ) or put it in another place different than your house (maybe another house, or a car, you know it...)
If your house burns, you'll recover all your funds from the seed. Same for natural disasters. As long as you have the seed you can recover all your funds.
In my opinion the best you can do is to memorize your seed like a poem... repeat, repeat and repeat it every day until you will remember it easily. Everything could burn, be destroyed,or broke, except your brain...