My most important suggestion is bring 9.0 aff with no SE and 2min Darkglare.
Atm in the tree there are way too many. Having a 15 button rotation not counting all the utility ones is insane.
The buff your filler playstyle is bad, and Malefic wrath especially is way too much as a maintenance buff that requires you to cast another spell to get its dmg out, its only st. Even it was buffed so it rewarded you for playing pure st, I wouldn’t like it. You get shoehorned into st way too much and calamitous crescento is just a band aid in 2-3 target situations imo.
Out of the buff your filler talents, I would remove Dec bolt(maybe make synergy a capstone), Withering bolt and ofc MW, but maybe keep Calamitous crescendo so you are rewarded for casting your filler.
Shadow’s Embrace is way too annoying as seen in 9.0, bake a % buff to UA so there’s a tuning knob for st and bring focused malignancy as a talent for more of the same.
Darkglare is a lackluster cd that is even way down is the tree. Wilfreds was never in its history good for aff. I would say baking DS misery into DG, even with less potency, it would be much more preferable. Also maybe give its beam some cleave, so it does smth in aoe.
Soul swap has no place in a spec that has MR, even if you make like the old soul swap that copied all dots, it will compete for your shards with MR in low target count situations.
Siphon life it another dot just for the sake of having another dot, I wouldn’t mind replacing it with something else. Maybe even a talent that makes your UA count for 2 dots for MR, but that’s just a suggestion.
Pandemic invocation is a bad talent when you have things like calamitous crescento. Its super unsynergistic, just remove it.
Creeping death is a talent that conflicts with MR, you want your dots to last long enough for you to spend your shards.
Summon Jailer is another buffon with no synergy, just remove it, we have plenty of buttons to press and instead of trying to remove ramp up, give us options to reduce ramp up vs more dps options. To be honest the general class tree shouldn’t have capstones that give you more buttons into your rotation. I kind dislike soulburn being another button plus it also takes dps for utility and would prefer making some of its options as selectable talents, but I don’t feel as strongly about it as the rest.
Grimoire of sacrifice has such a central location while being the most anti-synergistic and never worth picking talent in recent years.
Accrued Vitality also needs to be moved.