Low 2 to sub 2min 800m

19M

I'm having issues getting my 800m time low especially finishing the second lap. I run a 52-53s 400m and opened my recent 800 with a 57 which was definitely faster than I wanted but I felt good untill I hit the last 200 where I tried to start my kick but died and ended up running 2:09 total for the race.

I'm really struggling after switching my focus from the mile to 4 and 8 and I feel stuck like I can't progress anymore.

My training load is 40-55 miles a week with a 10-12 mile long run every week 2x workouts one tempo one threshold/max effort.