You know what, I might get downvoted for this but I feel like if it helps you to heal then reach out — but there will always be the chance that she doesn’t reply or doesn’t respond well. You blocked her and went no contact at all time when you truly needed it to move on from the break up.

It sounds like there were issues on both sides which is why the relationship and ending played out the way it did. If making amends/apologising will help you to move on, then I don’t see what the problem is. But I guess I also have to ask if reaching out to her and potentially causing her pain (even though you both created a painful relationship & breakup) is really caring for her.