I would try getting them back to better health before thinking about trimming them as they're already under stress at the moment. Cutting them back would be too much for them to cope with l feel. Is it possible to repot them if you can ? If not, l would concentrate on maybe giving them a top dressing of fresh compost and feeding and watering as @ Hostafan1 suggests.
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My guess is that they've dried out at some point.
The pots are a little on the small side.
Is it possible to repot them if you can ? If not, l would concentrate on maybe giving them a top dressing of fresh compost and feeding and watering as @ Hostafan1 suggests.