Time to replace all Exterior Doors (3) and Sliding Glass Doors (3) and replace Exterior Windows (13) with Brand New Insulated good stuff. Crappy part is windows are double sided vinyl that are only about 10 years old, but previous owner went cheap on the material and installation, so they are drafty as well.
Roof is maybe 5 years old and fine, Attic Insulation is the typical 3-4 inches, adding another 10-12 would make it R-38 and perfect.
I've thought about blown in Cellulose for the Exterior Walls because I have some big sections of Rock and Wood Siding that I know lets in drafts, rest of house is stucco.
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