Caffeine or none?
I do drink way more caffeine than I should. I have also gone cold turkey -- 0 caffeine for a year from any source with no difference in my chronic insomnia, but a groggier awake period.
I grew up a tea drinker. Coffee was a Sunday morning sort of thing, tea the rest of the time. I tried to add more dairy in my life and found I didn't like it in my tea without sugar but I do love a good cuppa. I could, however, drink coffee black or with just cream and that was fine. So when I had to cut both sweeteners and sugar out of my life (ack! that same year I couldn't have caffeine either), I went back to herb teas. Used to drink a lot of different herbal blends and generally grow or forage things to use. I have this whole new area to me with new plants that I haven't learned yet -- but I can still brew up some pretty tasty Alaskan stuff
Found a sweetener I could tolerate and am very happy to be back to tea, with milk and sweetener as my drink of choice.
Right now, I'm drinking a tea that nobody else seems to like -- but hey, there's enough of a market that it is readily available. Lapsang Souchong, a smoked tea. Is my favorite winter tea and love to drink when the snow is falling. I describe the smell of the tea leaves to be "old ski boot" or consider a leather hiking boot. I guess it's an acquired taste.
https://en.wikipedia.org/wiki/Lapsang_souchong