Explaining "Let well alone"

What does it mean?

The phrase "Let well alone" means to avoid interfering with something that is already satisfactory, as any change might worsen the situation. It advises leaving things as they are when they are acceptable.

Tone

Origin

"Let well alone" is an old English proverb dating back to at least the 18th century. It's an earlier form of the more commonly used "Leave well enough alone."