Alright, so what I am taking from the feedback is focus on the Coven mechanic, it has potential. But make sure it's unique and stands out while making it interesting.
Change the sacrifice mechanic, either make it something without draw back or less draw back.
Let us look at all the main spell casters and see how they handle their spells:
Warlock - spell slots that recharge on a short rest and up-scaled to a max of 5th level spells, with also at-will Invocations and a 1/day 6th, 7th, 8th, 9th level spells at the correct levels.
Wizard - writes spells into a book, memorizes which ones they want to use ahead of time.
Bard/Sorcerer - knows a certain number of spells, casts them from their slots.
Cleric/Druid - have the option of choosing all spells from spell list ahead of time.
I tried to do a unique thing by mixing the Warlock option with the Bard/Sorcerer option. Giving them spell slots which can be used for their Origin/Coven spells, spells gifted to them. And using regular spell slots for the spells they learn on their own. Though both are limited (not to the max of either type), there is a lot of casting flexibility. That is also why I added a sacrifice for the Witch, just so her power wouldn't seem out of control.
One thing I will remove are the extra drawbacks on the Deafened sacrifice. It makes no sense for somebody who could hear their whole life not to be able to speak correctly causing their words to malfunction later after being deaf. They already know what the words feel like.
I may add a couple more, less "harsh" sacrifices the Witch can use for power, such as "Loveless," never able to find love, and "Aged," where the Witch is aged to a venerable age. So that way a player can choose what Sacrifice is appropriate for their power.
I feel most witches are under the "Soulless" sacrifice, giving up their soul for power. It has no cosmetic or mechanical effect aside from not being able to be resurrected. But that makes sense because you have given your soul to a higher power. And like I said, at 9th level the Witch receives an ability that helps them with their Sacrifice.
For example, the paralyzed Witch can Levitate once she hits 9th level. She has an hour usage of it and can spread it out any way she wishes throughout the day. She regains all spent usage of it at the end of a Long Rest. She also doesn't need to Concentrate on this Levitation, as it's an ability granted to her from the higher power for being a good servant.
Quickleaf, I agree with you on why the Witch is an Intelligence based caster. Those were my thoughts as I chose to set-it-up. Though, I could understand a Charisma based caster for the Witch as well, but I feel D&D has too many Charisma based casters.