So that the human has a chance...

Increasing the human time is not an option, since no one wants to watch 8 hour games, and fatigue could also come into play, so the only real option for a winning chance is reducing computer time/power

You do not have to watch it live. Correspondence chess is a real thing (https://en.m.wikipedia.org/wiki/Correspondence_chess), with fewer blunders than tournament chess.

Correspondence go, similarly, would see fewer errors. Holding a world championship would take quite a bit longer than in chess, though (rough guess: 300-ish half-moves per game versus 100-ish half moves, the latter, I guess, with a bit more variation). That could be problematic, as a world championship in chess already takes years (curiously, some championships finished before the one started a year earlier did)

> Increasing the human time is not an option, since no one wants to watch 8 hour games

FWIW regular tournament Go games go up to 6 hours, and title games can take more than 16h and span over two days.