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After the wait step of 4 months, place the "change data value" flow step. For the change data value flow step click "add choice" and this allows you to only run that change data value flow step for particular leads.
Create another separate smart list (ex. Stage 9 Opportunity) with whatever criteria is needed to group together the leads in Stage 9 Opportunity. Back in the change data value flow step, the choice condition is going to be "If member of smart list: lead is in: Stage 9 Opportunity": Do nothing and the Default Option will be to change data value to False.