Make two new conditions in the starting perks and change the inventory. The number of slots is limited, the number of combinations of similar items is also limited. The first perk reduces the number of slots and the second makes them unlimited as now.

Add an enhanced healing perk that beneficially restores a little of the player's willpower (for example, for 60 magic, restore 10 willpower). Add a tentacle spell with darkness damage in the "shadow blessing" branch. The ability to combine this spell with a fireball and a water ball (opens as a fire arrow for a bow), making them brilliantly purple. All without the effect of shackling. Ideally, it is better to create two new branches in the elements section, light and darkness, but this is my humble opinion)

Add resistance perks to certain elements if the corresponding elements have already been learned. For example, if you have learned Fireball of all three levels, you get the opportunity to take the perk ?-25-30-?% resistance to fire damage. So that, for example, smoldering coals do not cause damage to the player.

I also suggest considering adding the "flight" skill to the telekinesis branch, but so that it would be available for 10 points through the starting perk like petsuit.

Flight allows you to avoid ballet heels, but completely removes evasion if the character is bound. Combines with psychokinesis. If the character is not bound, it has an evasion bonus, but loses melee and ranged weapon accuracy.