A district nutrition officer in Odisha is reviewing data from ICDS anganwadi centers and finds that 35% of children aged 6–59 months in a block are stunted (height-for-age <−2 SD). The anganwadi workers report that supplementary nutrition is being provided regularly, but dietary diversity at home remains poor due to limited household income. The officer wants to address the root cause of stunting in this population. What is the most appropriate next step in the ICDS intervention strategy?