The leaves are graying on the edges.
Why Have My Lantanas Stopped Blooming?
Certified GKH Gardening Expert
Your plant may be affected by a fungus or spider mites. The stress from either will affect flowering. You can use neem oil to kill spider mites and relieve any fungal issues as well. Here is additional information that may be helpful: https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm