Usually in most plabts, and humans, of a certain age, TLC is required.
From your picture it’s difficult to assess its habitat. But I’d geuss it hasn’t a great deal of growing room to have it’s daily stretch?
I have an abundance of different trees , shrubs and alpines and over many years have, as suggested always removed the dead growth and foliage from plant and base area of the plants.
Top dressing and feeding is a must for just about everything no matter how hardy
D G Hessayon has been my best pal and saviour in the garden for many years. In this case Hessayon ‘Tree and Shrub Expert’ is worth a trip to the library if you’re as old as me. Or have a look on Amazon?
The cost appx £8. Good luck