Good advice doesn't really exist in the same way bad advice does, because the same things can ruin anyone's lives but everyone needs something different to fix theirs.

I think it's the other way around.

Anna Karenina principle: all happy families are alike, but each unhappy family is unhappy in it's own way. Or: there are many ways to be miserable, but only a few ways to be happy. Or: entropy increases.

A couple of pointers would lead the vast majority to better lives, but there are so few of these that you can't build a publication around it.

If every unhappy family is unhappy in its own way, they each need a different change to become happy.

What kind of advice? Relationship advice probably might not be the best to take clickbait seriously.

Their family and good friends. The attempts to replace those with technology/media for various uses have failed, beyond maybe some less important ones e.g. "what's a good refrigerator to buy?"