I think last year I got in my head - 'I've been running for a year now and I should be able to do X,Y or Z pace' And I was running too fast on most of my runs. Leaving me tired, poor recovery and not really building endurance.
The main thing I've done for the last 4 months is completely forget about pace and focus on deliberately slow running. I used to do 06:00-06:30 min Km. Now I'm trying to do 07:00-07:30 min Km. Or another way to think of it is just in terms of effort levels. So most of my running is trying to do an 'I can do this all day' or '4/10 effort' pace.
So for the last few months I've done:
Monday - 5K at easy pace
Weds - Intervals (currently 5 min warm up run, then 1 min 'faster', 1 min 'slower' to recover x6 reps - but I need to move to something more progressive)
Fri - 'Long run' at easy pace - adding 0.5K each week. So I spent the last 10 weeks building back up to 10K.
Here and there I treated the Monday 5K as an opportunity to try for more of a PB pace (i.e closer to 06:00 min Km) to try and hit sub-30