The thing that helped me most when I was in management was using the 4 quadrants from the 7 habits book.
Everything gets a yes/no in urgent and a yes/no in important.
If it is urgent and important prioritise that. Then for future stuff, make space in your diary to do the things so they never become urgent again. Actually book it in. A monthly report that takes half a day to write, book it in a week before it is due every month. And so on.
Not urgent but important - do that next. Plan it in. Again, use your diary to make sure it is all covered. This includes staff and partner liaison. Catch ups, meetings, whatever. Make space for off the cuff urgent stuff once a week that can give you breathing space if not used.
Not important or urgent - bin this. All of it.
Meetings that are just meetings for meetings sake - bin these.
Time spent doing minutes - bin this. Do action notes in the meeting assigned to individuals and circulate before you leave the meeting. Or assign someone else to do the same.
I binned off 'agendas' as well, I asked people in advance what they wanted to discuss and how long they wanted and it went up on a white board at the start and once it was all done, we went home.
I binned 'AOB' at the end. Nobody wants to sit through 5 Any Other Bollocks at the end of a long day in a meeting. If it isn't important enough to be on the whiteboard as a stand alone thing, then is it worth it in the first place?
And delegate delegate delegate. As soon as someone is in a position to take on more responsibility give it to them. It helps everyone and furthers their careers as it gets onto their CV