Note with the worldwide number Endgame for a time was beating Avatar. Well during the pandemic there was an international rerelease of Avatar 1 and now Avatar is firmly in the lead.
We should allow for inflation. The Sound of Music was a blight on my childhood, it was in cinemas and selling them out for years straight. It's only not the biggest movie ever because inflation isn't counted in sales.
The end of what Son? The story? There is no end. There's just the point where the storytellers stop talking.