I want to go no contact with my exgf
Why don't you want to be in contact with your ex?
I prefer to move on completely and find someone else.
While they are your ex and you have no need to be invovled with them anymore, it seems like you are still on good terms. It would be very hurtful to just ghost her, so you need to be up front and tell her why to spare her feelings.
I'm so sick of her, I think before I cut her off, I'm going to call and curse her out.
You should just tell her you're going to end contact with her because it isn't healthy for you. Just ghosting her first will make matters worse and if you call and curse her out, you're just going to make her more upset for no reason.