Honestly, skip Monte Cristo for now. If you want to read a big book, read something more unique. Try Dostoyevsky for metaphysical musings, House of Leaves for an SCP-like mindfuck, or Moby Dick for some of the most beautiful writing mankind has ever produced and a truly autistic enthusiasm for the sea.
I might be in the minority on this opinion, but I find it valid: Monte Cristo shows its age in an unappetizing way and it’s clear the work was serialized. It lacks potency or substance when compared to the other works I mentioned, and it seems like you’ve got a thing for books that say something.