I quit coffee cold-turkey in Jan of last year [^0] due to health concerns. I ended up replacing coffee with a mushroom tea called Rasa [^1]. It’s pricey, but like you, I enjoyed the bitterness of black coffee, and its strong flavor. Being mushroom-based, Rasa has those strong, dark, bitter qualities . I like the Bold variety the best.

[^0]: https://keygen.sh/blog/i-quit/

[^1]: https://wearerasa.com