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I hope you at least read her books with the biggest payoffs:

And Then There Were None

Murder of Roger Ackroyd

Murder on the Orient Express

The ABC Murders

If you read these three Agatha Christie novels you'll never think about mysteries, in any form, the same way again.

I recommend this order:

The Murder of Rodger Ackroyd

And Then There Were None (also titled Ten Little Indians)

Murder on the Orient Express

I think I've read every single Poirot, my favorites are:

Murder on the Orient Express

Death on the Nile

Appointment with Death

Cat Among Pigeons

If you want a breadth of grounded fantasy (IE takes place in our world but contains elements that don't really exist in our world) then I would recommend picking through Stephen King.

If you want to completely escape our world then I recommend the old Conan books or the modern Brandon Sanderson starting with Stormlight Archive.

You have received plenty of Sci Fi recommendations but I will add my own personal favorite (this is one novel in the series):
https://en.wikipedia.org/wiki/In_Death_Ground

If you want fiction that is grounded in reality with little to no fantasy elements then the murder mystery genre has quite a few gems that are fun to try and guess the twist of when you are reading. Murder on the Orient Express is great if you havn't experienced the story yet.

For anyone who has never read Agatha Christie, I highly recommend the following:

- And Then There Were None

- The Murder of Roger Ackroyd

- Murder on the Orient Express

- The A.B.C. Murders

The books are usually "slow burns", meaning they slowly build up to the big reveal at the end of the book. Agatha Christie is the master of making great payoffs though, so despite the initial slog, by the last page you are usually awash in dopamine/adrenaline (okay maybe that's a little exaggerated, but these books really do have good payoffs).