Eventually I realized I had stopped coping with caffeine and, instead, started coping with *sugar*, and gained 20 lbs in the process.
I'm back on caffeine again, but the rules are: one (1) cup in the morning, however I like it. Then water for every other beverage all day long. That seems to have done the trick, and now I again sleep through the night and can more easily remain focused throughout the day.
The point is, experiment, yes! But it's your body and your mind. Take notes and figure out what works best in your case. Everyone is a little different.
I ultimately found that reducing was a good idea, but I personally like coffee a lot and feel it adds something for me. I also have adhd though, so I’m probably playing with a slightly different deck on the “how stimulants interact with the brain” front.
I have found that having controls and limits around caffeine intake is a pretty good practice. I found that to reliably sleep well, I need to never drink caffeine after noon. And reducing my intake a bit helps as well. But from there, I haven’t seen much further benefit from quitting entirely.