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skinny
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@JB
Sorry my message was very vague. Yes, you can probably restore some of the loft of the bag, but there's no doubt that after compressing a down bag for four years that there may be a permanent loss of loft. Dan Timmerman of Timmermade wrote this Re down compression:
Down, and any other fibrous insulation, has a memory. Every compression is some amount of a dent in it's ability to spring back up to full loft. The harder the compression and/or the longer the compression, the bigger the dent. So, in theory, the less compressed and the less time, the better. However, down plumes are extremely resilient against these compression cycles so you can get away with long compression cycles, but it's something to be aware of and just make an effort to limit it, if you can. Don't sweat it too much if you can't.
Really, moisture is your main concern, rather than compression. If there's condensation in my shelter when I wake up, I'll make an effort to lay my quilt/bag out in the sun while I'm having lunch or a short break. Similarly, whenever I get home, I leave my quilt/bag out for a good 12 hours before I put it back in its cotton storage sack.