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My guess is that there is a lot of air leakage going on underneath the cellulose. Ideally, the attic floor would have been completely airsealed before cellulose was added, but this does not always happen. I would start by looking for plumbing stacks, electrical penetrations, etc and foaming them. Look for dropped soffits and changes in height of ceiling. There could be bigh leaks associated with this area. Do not foam anything that produces heat like a recessed light or chimney. Work smart and safe. You are responsible for your house's safety, if you do it yourself. Do a little homework before you start on the internet to see how other people have done it. Check the top plates and see how big of a gap there is. This will be difficult because the cellulose is difficult to clean out, but anything you can seal will yield lower energy bills and make the insulation you have more effective. Make sure there is adequate ventilation in your attic. Airsealing will reduce the amount of water vapor entering the attic from the house, but will also make your house tighter. This means that bath and kitchen fans become more important. Make sure both vent securely to the outside.
You could check how much insulation you have up there. In central NY we add cellulose to a total depth of 15.5 inches. so if you have less than that, you could add more after you air seal.
good luck,
-James
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