avoiding blue/green fade

Hi guys!
I'm posting this because I'm in dire need of help:

I bleached my hair in May but did it 3 times in a short time frame, so it got a bit damaged, but since it's quite strong no great harm came to it! It was blond but then I decided to put directions ebony to get it to black, and it never got black, only purple, then blue and then green. I went to the salon to try and fix it, but the colour was always washing out. So since then I've only been using directions red tones to balance out the green tinge on my cuticles, but last time i mixed a bit of ebony with vermillion red and now it's purple again heading for blue.

I wanted to get a natural shade, and was wondering if maybe using colour b4 and then something like adore dark chocolate would work. Any thoughts?

Thanks in advance!