Have a look at mcmillan pace calculator to give you an idea of the speeds and times you need to be running to get sub - 25.
For example, your 400m intervals should be 1:45 to 1:52 mins each.
From your brief post you are running five times a week, and all five are "hard" sessions. I'd keep your 400m intervals and the long run, but for your other three "hard" runs I 'd reduce the pace of two of them, and for the remaining one change it into a tempo, e.g. 1 mile warm up and then two miles at 8:17 to 8:35 min/mile (based on mcmillan) followed by one mile cool down.
You haven't said a lot in your post - but if you are repeating the same training each week, you are going to get the same results. For the intervals, try mixing it up or adding a few extra intervals. E.g. if you are currently running 5 x 400, try 6x 400 then 7x 400 the week after. Alternatively, mix in some 600m sessions, e.g. instead of 6x 400m do 4x 600m.
