I quit caffeine a few years ago. I'm not an unusual mutant. I have the genes on markers rs4410790 and rs2470893 that indicate a typical reaction to caffeine. (https://enki.org/2017/08/13/quitting-caffeine/)
Most people experience a temporary increase in productivity until they build up a tolerance for caffeine. Thereafter, they are just paying and consuming to avoid headaches and reach the baseline.
No, it is also for a great deal of enjoyment.
I used to drink at least 2 cups of coffee a day, and at least 3-4 of black tea.
over a year I slowly backed down to just a single coffee coffee in the morning.. then eventually switched to decafe coffee for that one. I had headaches for about a week, and I think I was irritable.
Recently I stopped even the decafe coffee, and now drink 1 or 2 decafe tea a day when it's cold.
I feel great, save money and don't miss the ups and downs of real coffee - I used to get the sweats, shakes, funny shallow breathing, etc. etc.
I also had no idea I was living life through a "fog", that I didn't even know about until a few months after I stopped. Life is much better now.
Then itβs magically gone.
Not even close to a full week.
Just do it.
I also recommend /r/decaf where you can get support from others who have been and are going through decaffeinating.
I assume, because you did it, that you're one of those mutants who doesn't use it nor like it much. Good for you and all, but caffeine made the modern world, the majority of the population uses it every day, and industrial society wouldn't function without it.
It's also super-cheap even on a modest salary, and most workplaces give it away for free because of how necessary it is to production.