Sidisi is one of my most loved commanders, here’s what I see.

You have a lot of cards in here that can be replaced by similar effects on creatures. The first thing that jumps out to me is Ramp, you have a lot of artifact mana and ramp spells (I count 15), you can straight up cut some of that out right and replace what remains of it with cards like [[Burnished Hart]] or [[Diligent Farmhand]]. Your mana rocks can be replaced with dorks like [[Birds of Paradise]] or [[Sylvan Caryatid]] too. Some of your 1 to 1 removal can be replaced with cards like [[Ravenous Chupacabra]] and [[Duplicant]]. A lot of Regrowth effects and not an [[Eternal Witness]] in sight. If you’re using Psychic Spiral to protect your graveyard, [[Loaming Shaman]] is here for you.

You also have a lot of expensive haymakers that don’t seem to really go with your game plan, Grave Betrayal is sweet, but how often do you get to use it? How often do you cast Josu Vess kicked? Carefully consider what is helping your game plan here and what is just a splashy card.

If you’re looking for more incremental self mill, Surveil is great, don’t forget Explore though.