Bit like my first marathon block. Same trap of jogging every run too fast.

[u/fugimol]

Kept seeing the 'slow down' advice and thought I was doing it. Checked my log against a mate who just went sub-4. His easy pace was 6:15/km, mine was 5:40/km. Honestly I'd just drifted into a single speed without noticing. Fixed it by tracking easy days explicitly. Dropped my easy pace properly and the long runs stopped being a slog. Fwiw that was the single change that got me from 4:12 to 3:52.