So, I made some edits, I added some recursion (as well as mill), fixed the removal spell (changed "Overwhelming Remorse" with "Defile") and added another graveyard payoff. As for graveyard payoffs, I'm more interested in creatures that get stronger rather than those that get cheaper. I am now mostly satisfied with my deck although it is missing a bit of card draw imo. Here's the list and let me know what other upgrades you suggest.

Decklist -- Self-Mill -- Shared via TopDecked MTG

Main (60)

4 [[Mire Triton]]

4 [[Wailing Ghoul]]

4 [[Eerie Soultender]]

4 [[Gorging Vulture]]

4 [[Liliana's Elite]]

4 [[Thraben Foulbloods]]

4 [[Defile]]

4 [[Corpse Churn]]

4 [[Unearth]]

4 [[Ransack the Lab]]

20 Swamp

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Shared via TopDecked MTG

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https://www.topdecked.com/decks/self-mill/a3a3e126-ae6c-48ab-a441-d97bd303a3f3

I'm considering adding the following:

[[Dread Return]]
[[Echo of Dust]]
[[Join the Dead]]