I have had sleep issues my entire life. I've cut out sugar, caffeine (both for other reasons), and used blue light filtering applications on my devices. None made a significant difference. I think another issue worth looking at is people not getting a daytime light signal. I've purchased and ultra bright light that I saw in this post [1] and it seems to have helped more than anything I have tried before.
Yep, reducing blue light at night is an important part of the problem, but it's not a panacea. We realize that everyone has different sleep needs, and much of our focus this year will be helping people understand what inputs have an effect on their sleep.
1. https://www.benkuhn.net/lux