Q.My late flowering ‘mum is presently just a mass of twigs with no signs of buds. I’m not sure what to do. Should I be pruning?
Should I recompost the plant to encourage growth? ( sorry no pic)

Certified GKH Gardening Expert
If mums return, they usually have new growth sprouting from the bottom of the plant. The top twigs are pruned off. If you don't see any growth by now, you can consider it lost.
The mums planted in fall are often treated as annuals. Spring planted mums, hardy mums, are more likely to return the next year.
These articles may help:
https://www.gardeningknowhow.com/ornamental/flowers/chrysanthemum/growing-chrysanthemum-flowers.htm
https://www.gardeningknowhow.com/ornamental/flowers/chrysanthemum/chrysanthemum-lifespan.htm