TLC for raised beds

My raised beds are now 3 years old and I think they are tired. I didn't grow much this year because I was too busy finishing my MSc but what I did grow didn't do very well. They clearly need some more compost digging in to raise the level and revitalise them.

Any other suggetions as to what to add to bring them back to life?

I sowed green manure mustard on mine last week (because of the Aminopyralid problems with bought in manure). Will dig it in in the spring and use lots of chicken manure pellets.

I always use a sprinkle of blood fish and bone before I plant anything as well

Collect bags of dry leaves from people throwing them out, crunch up the leaves in some way (mower, kids stomping on them, etc) and mix those into the soil. Its amazing how they revitalize poor soil.