How do I rescue my 2 bronze cordylines? Their leaves are mostly dead but they have new sprouts top and bottom?

These cordylines are planted in large tubs outside. I have taken off all the leaves on the one cordyline so there is just the trunk with new leaves sprouting at the base and top. On the other the leaves are very tatty but do not want to drop off yet, this is the same, sprouting at base and at the top.
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