u/Elder_God

I'm DMing a Fabula Ultima campaign with all the atlases (High Fantasy, Natural and Techno) for 3 months now, it is nowhere near the end but one of the players is getting more involved in his work and we are going from a weekly game to an almost monthly game.

I'm thinking of DMing another campaign to the same players minus the overburden one, but I want something that feels the exact opposite to what we are playing now. Call of Cthulhu and other high lethality games would be the logical answer, but I want something that is still able to play a middle to long term campaign.

What you suggest would be the best system to completly change the mood of the table?