Ask HN: How do I stop caffeine intake without losing productivity?

I started using caffeine with coffee and tea around 5-6 years ago, and had major benifits cognitively and enjoyed the mood boost also. However, my caffeine intake has gotten to the point where not having a cup of coffee for even 24 hours leaves me with a bad headache and fatigued. I have tried to stop using caffeine in the past, but my productivity has always dipped significantly, and with school/ work I know that a dip in productivity would have big negative effects on my life that would not be worth it. So, knowing a lot of you guys consume a lot of caffeine, is there any methods you guys have used to stop using it besides going cold turkey?