WARNING! Major spoilers for Lovecraft Country ahead.
Lovecraft Country concluded with several characters meeting their end in Ardham, including Atticus "Tic" Freeman (Jonathan Majors) who is likely dead for good. As the season 1 finale title suggests, everything came "Full Circle" at the rubble of the Sons of Adam's lair as Attius's blood spilled for the sake of Christina Braithwhite's (Abbey Lee) spell for immortality. Here's why he is likely dead for good and will not return for Lovecraft Country season 2.
Misha Green's HBO series is adapted from Matt Ruff's 2016 novel of the same name. It initially began as a son's search for his missing father but quickly transformed into a fantastical story featuring time travel, mythological creatures from Korea, and important moments in Black American history. During season 1, episode 10, "Full Circle", several characters including Letitia "Leti" Lewis (Jurnee Smollett), Ruby Baptiste (Wunmi Mosaku), Christina Braithwhite, and Atticus met their end. While Leti was revived due to Ruby restoring her invulnerability spell, the remaining characters are conclusively dead until the showrunners choose to announce otherwise.
It is entirely possible that Ruby is not dead for good. This is solely based in Christina's use of the polyjuice potion that allowed for her to transform into Ruby to trick Leti. In order to shapeshift into another person, the individual you wish to use as a disguise must remain alive, like William, who is in a comatose state. There are two characters who are unequivocally dead: Christina and Atticus.
Since the very beginning of Lovecraft Country, Atticus was destined to be apart of Christina's immortality spell. As it was revealed in episode 6, "Meet Me In Daegu", Ji-Ah (Jamie Chung)—a kumiho spirit from Korean mythology—sees his future and his death. The two of them met at least a year prior to the events of the series. The fact that Atticus died in the exact way that she envisioned means that he was always going to die, and it couldn't be avoided no matter how hard they tried to change the future.
As Christina began her spell, she cut open Atticus's arms and drained him of all of his blood. While covered in it, she welcomed in all of his magical capabilities. Since Atticus was drained of his life force and magical essence, there is nothing left of him besides his body, legacy, and unborn son. There are several ways that he could come back to life, but it is not probable that the series will choose to take such a complex route. To bring Atticus back would possibly require interdimensional time travel with Hippolyta, Leti learning resurrection spells, or even the spirit of Atticus finding a way back into the realm of the living.
Atticus is likely dead for good because his story line is complete, and there's nothing left of him by the end. The entirety of Lovecraft Country season 1 was dedicated to finishing his story, therefore, it's unlikely that it would be carried on in the future of the series. He completed his mission, which was to keep his family safe. Atticus's death was tragic, but it also served as a sacrifice in keeping the Freemans safe, bound white people from using magic, and kept the Book of Names in the family. Episode 10, "Full Circle", even hinted at Diana Freeman taking over as the main character for Lovecraft Country season 2 now that Atticus has completed his role, so a future story would likely follow her and the other survivors instead.