800m training/mileage

Find a good 400 coach and stick with it. Your talent lies in the 400 not the 800.

You're endurance is not very good so you would be better off focusing on the 400 where you have a better of gaining college attention.

I'm really close to breaking 2 so I want to stick with it. I'm trying to increase my endurance. My 400m has plateaued as well. I haven't ran sub 50 since the beginning of May while my 800m time has continued to drop

Improve both by improving your lactic tolerance

Work on fast 300m work outs

Perhaps 4-300m with 6min rec at sub 40sec once a week

On top of the other stuff

This year at the start before I switched back to just sprints (48.5/22.2) I ran 1:58.7 in the local countie champs. My one and only 8 race of the year

Your 400m has plateued because you are listening to people like fitness joggers on letsrun talking about mileage instead of training properly for the event. There are a certain number of high school 400 runners that do XC in the fall, then do 400 with sprinters in the spring. But this is not exactly optimal.You do have to be careful about doing too many hard 300s too early, because that can cause you to peak in 12-16 weeks. BUT, you don't just jog mileage.This is what Clyde Hart has college 400 runners (times set for 46 second 400 runners, and you're supposed to not go faster than the listed times adjusted to your ability level) doing this time of the year: