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Seal the gaps and unused holes with aluminum HVAC tape (NOT 'duct tape'). Use expanding foam to seal the crack between the fan housing and the top of the bathroom ceiling. Build up insulation around the fan housing. Use more of whatever kind of insulation is in your attic now.

From the inside, with the grill off the fan housing, use more aluminum tape to seal the inside of the housing to the ceiling, keeping inside the footprint of the grill.
 
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