I prioritize ride waits, so I would say do Gringott’s @ Diagon Alley during early hours and the park hope via foot to Hagrid’s. After that make your HP lands plan.
May be easy for me to say since I am not an HP fan, but I would also go for the shortest wait times. I'd rather give myself a chance to do more things than to try to do things in some 'right' order - particularly if you only have one day.
I'd hit IOA in Early Entry and ride Hagrid's first. Then FJ. If you want a great ride that is outside of HP stuff, do Velocicoaster next. Alternately, you could just walk around Hogsmeade and check out the shops, wand locations, grab a butterbeer, etc.
Then I'd take the train to USF and do all the Diagon things: Gringott's, Knockturn, Butterbeer or other drink of choice. ice cream, shops, wand spots, etc.
Depending on closing hours, I'd probably try to hop back to IOA to ride Hagrid's at night and see the Hogwarts show. Also gets you to walk through the platform wall and get the train experience in the opposite direction. To me, the train takes a lot of time, so I would try to limit to riding once in each direction max.
Interested - why were you wanting to end the night in Diagon?
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