How would you go about a “revive from dead” scenario

Like how would you reasonably reviving a dead person, like bringing them back from hell type of revive. And furthermore, there isnt even a body to revive with. Im not considering seance cursed technique. Cursed object reincarnation doesnt count too. I dont expect a full canon explanation, you could add your own headcannons on how to pull this off, what sacrafices would be needed to make for a revival of sorts. This question is asked in order to write a fanfic (not about gojo)