Writable DVD longevity seems to be a bit of a crapshoot. There are stories of people reading 20 year old burned DVDs just fine and others getting errors on discs only a few years old.
If I were worried about longevity, I would not personally rely on a bunch of DVDs I burned.
To be fair, pressed discs have succumbed to disc rot as well.
If I were worried about longevity, I would not personally rely on a bunch of DVDs I burned.
So load the files onto hard drives as a backup. That's what I do.
It doesn't seem like you're looking for a solution, just a method to hear yourself complain.