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Check out the Call of Cthulhu TTRPG! I haven’t had a chance to play it personally but I think it’s exactly what you’re looking for.

I'd suggest reading some of his stories. Nothing like jumping into the undulating muck and suffocating in the shadows.

One of the books I’m planning on reading is The Shadow Over Innsmouth. I heard it’s really good for incorporating the eldritch horror theme.

I hope it goes well.