This takes many years to come through. The years when you were in contact - being repeatedly insulted, scapegoated, manipulated, gaslit etc and where you tried and tried and tried to address it and resolve unsuccessfully.
Then the slow decisions to go NC. That takes a lot of emotional strength and resistance. I am sure that there have been shorter periods where you haven’t spoken before - and then you get lured back in due to FOG (fear, obligation, guilt - always the WRONG reasons to do anything) - for it all to kick off again.
The first year is tough - a year of firsts - birthdays yours / there’s, events Xmas, Easter, Bank holidays etc. But keep looking ahead and get stuff proactively booked in.
The rage, anger and hurt will wax and wane for sometime (drinking won’t help, events trigger it) - it needs to be objectively processed. It might be worth treating yourself at this difficult and fundamental chapter to further therapy - reallocate the birthday and Xmas gift cash you won’t be using!
You need to go through the full 5 stages of grief process. It’s not a straight line - it is hyper emotional in the early stages of denial, anger and hurt - and this settles to sorrow and sadness that you never had the family you deserve, that the people who should have cared for you have actively hurt, wounded and scarred you emotionally. That they will never apologise - they don’t see it like you do - your energies and efforts there will be futile. So final destination is acceptance. Along the way you need to have self compassion - to look to actively heal those wounds yourself.
What becomes obvious is the huge gap left by these emotionally draining and toxic people. They took up a lot of your time, energy, headspace. That’s why you didn’t have time to seek, nurture and bond in healthy friendships.
But now you have - and should seek to fill it with new acquaintances that will slowly grow to friendships where kindness and respect are standard - which are mutual, equal, lighthearted and fun.
Surround yourselves with radiant, warm, emotionally healthy people - view your toxic family flailing around in the dust getting smaller and smaller in your rear view mirror.
It’s tough, painful, ups and downs, twists and turns. But keep focused, distant, detached, dignified and forward looking to a much more peaceful and joyful future.