A lot of people have already advised you, I'm just here to give you my experience.
I went no contact a little under a year ago. I talked to my therapist about it beforehand. I had my med dr saying the whole "but they're your family", while my therapist said no, you tried setting boundaries, explaining when things upset you, they don't listen. She also warned me that by cutting contact, even saying it's temporary to them, if I wait a year to contact them again be prepared for them to be angry with me.
I wrote a simple email to my mother and her sister saying I needed space and please don't contact me for the foreseeable future, I will block calls, etc. And I will contact them when I'm ready.
I have been very glad I did it. At first it is REALLY painful. I used to call my mom every other day, even just to talk. But I realized how much better I was without that. I got really angry, I didn't even realize how much more angry I was then till these past months without them. Especially this time of year. I spend Thanksgiving and Christmas dreading it. Stressed to the max, trying to come up with excuses to get out. Etc. I get to do what I want with my child, without someone criticizing or making me their slave for the first time in years, and it feels wonderful.
Now in my families case, they're emotionally abusive, but I always say not as bad as what some other people go through. I needed to cut ties because I couldn't heal with them. They were re-traumatizing me whenever I was with them or spoke to them. So I mainly cut off contact till I can firmly say no and not let their guilt trips and manipulation effect me. Otherwise, again, I wouldn't be able to heal. And it is heartbreaking. But the rewards far outweigh the risks.
As far as advice, I'd say talk to a therapist, a good friend, someone that isn't family about it. Go over WHY, and is there another solution. Maybe like some people said to lessen contact if that's possible for you. Many people say no contact is the last thing you try, but every situation is different. Take care of YOU. If they love you, truly, they'll likely be hurt, but understand. Also as far as you might need them, look at times they've been there for you, was it for YOU, or did they later hold it over your head that you owe them because of this, or did they only make things worse?
I do still speak to one aunt, and that's what she's like. She knows I don't go to holidays at her house because my dad is there and our last interaction he was aggressive. She completely understands, but says I'm always welcome if I do choose to go. That's "family".
Last thing, friends can be family. I have friends that have done more, and been there for me more than my family ever has. They know what my family is like, and do whatever they can for me and my son.
It's a tough decision for sure. Good luck and I hope you do what's right for you.