Everyone on earth can suddenly read each other's minds

There is one possibility. This may not be the right book, but certain elements do come close.

The Cosmic Rape (August 1958 Galaxy as "To Marry Medusa"; exp 1958; vt To Marry Medusa 1987) a Hive Mind from the stars invades mankind but finds itself – to its ultimate betterment – catalysing Homo sapiens as a racial entity into one Transcendent gestalt: the sense of homecoming generated by the final pages of this short book is deeply touching.

I only read the shorter version in Galaxy, perhaps there might have been more detail in the expanded novel version. What I do remember is that everybody could read everybody else's minds as they came together in the newly created human-alien hive mind.

Hope it helps. This has been a real challenge to find a book that comes close.

Chaos Walking trilogy (2008) ("The Knife of Never Letting Go", "The Ask and the Answer", "Monsters of Men") which was adapted into a movie in 2017 and was "so unreleaseable" that it was was delayed by reshoots until this week?

Chaos Walking is a young adult science fiction series written by American-British novelist Patrick Ness. It is set in a dystopian world where all living creatures can hear each other's thoughts in a stream of images, words, and sounds called Noise. The series is named after a line in the first book: "The Noise is a man unfiltered, and without a filter, a man is just chaos walking."