I managed to shed some serious file size by removing quality that the average fapper probably won't notice nor care about:
Size improvements range from 3x to 20x, most notably with the more recent stuff and also 2019, which for some bizarre reason uses 
. In total, I managed to lose 16.2GB (18.2GB -> 2GB).
Unfortunately, I was already halfway done when I noticed that these are all 60fps. However, a quick test told me that reducing to 30fps wouldn't yield a lot (~20% less compared to the compressed 60fps version), so I stuck with 60.
DOWNLOADS
2019
	
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WORKUPLOAD
(4.61GB -> 400MB)
2020
	
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WORKUPLOAD
(4.90GB -> 804MB)
2021
	
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WORKUPLOAD
(1.16GB -> 167MB)
2019 Seele EX
	
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WORKUPLOAD
(710MB -> 62MB)
2021-03
	
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WORKUPLOAD
(515MB -> 38MB)
2021-04
	
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WORKUPLOAD
(608MB -> 76MB)
2021-05
	
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WORKUPLOAD
(434MB -> 50MB)
2021-06
	
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WORKUPLOAD
(520MB -> 42MB)
2021-07
	
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WORKUPLOAD
(1.44GB -> 159MB)
2021-08
	
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WORKUPLOAD
(1.94GB -> 82MB)
2021-09
	
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WORKUPLOAD
(3.29GB -> 65MB)
2021-10
	
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WORKUPLOAD
(3.19GB -> 93MB)
2021-11
	
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WORKUPLOAD
(2.41GB -> 108MB)
2021 Eula EX (Chinese Version)
	
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WORKUPLOAD
(925MB -> 74MB)
GX Supporter Pack
	
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WORKUPLOAD
(42MB -> 6MB)
Bronya Birthday
	
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WORKUPLOAD
(82MB -> 6MB)
Punishing Pack 1
	
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WORKUPLOAD
(72MB -> 20MB)
Gif Vocaloid Pack 1
	
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WORKUPLOAD
(55MB -> 5MB)
Genshin Pack 5
	
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WORKUPLOAD
(103MB -> 12MB)
Seele Birthday Gift
	
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WORKUPLOAD
(100MB -> 5MB)
Honkai Pack 2
	
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WORKUPLOAD
(598MB -> 67MB)
Honkai Pack 3
	
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WORKUPLOAD
(697MB -> 55MB)