For all the talk about a change in people's behaviour in crowds post-covid, the programming of acts, demographics, weather, stewardship etc, the main reason it was, indisputably, busier this year (than any I've been to over the last ten years, anyway) seems quite clearly because they sold more tickets, at least 7k more I believe. Total numbers this year were 210k, maximum capacity...
https://www.somersetlive.co.uk/whats-on/music-nightlife/glastonbury-festival-attendance-how-many-7241117