For someone quite junior, that's key! Bidding all the weeks means you'll get something awarded first cycle, and it will be the best you can do in any cycle. If you don't do this then in the second cycle those senior to you will take the leftover weeks from cycle one (which you could have had) and by the time it gets to you there will be even fewer decent weeks available. This is basically my bid,

Group One: Christmas, Thanksgiving, and a couple of other specific weeks I really want, then every week chronologically from Jul to Dec. I know I won't get the holidays, but you gotta try, then it's guaranteed you'll get the best Fall week your seniority will hold.

Group Two. Same as group one, except every week reverse chronologically from week 52 to Christmas, which will give you the best Spring week your seniority will hold.

If someone got zero weeks awarded on the first cycle this might be a good strategy on the second cycle, except there's no need to bid slots that have zero availability.

If there's nothing good left you can always use a week for the Super Bowl!