Custom Weekly Demand Not working due to YEAR

First off, please use the code formatting as described in:

The DATEPART() function can actually return week numbers as high as 53.
DATEPART(ww, '2020/01/01') = 1 (Wed of the 1st week)
DATEPART(ww, '2020/01/05') returns 2 (Sun of the 1st week)
DATEPART(ww, '2020/12/26') returns 52 (Saturday of the 52 week)
DATEPART(ww, '2020/12/27') returns 53 (Sunday of the 53 week)

you need to account for week #53. In your buckets (that use number of weeks relative to current date) Week 53 is the same as week 1 of the following year.

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