Considering your hair texture, natural haircolor, including the artificial color that you have been applying... the chances of you getting the color that you want is slim. You run a large chance of turning the lower half and ends of your hair into a slimy mush, due to over processing from your efforts to get all that artificial and natural pigment out.
If you are up to the challenge of the actual removal process, re-pigmenting and the DAILY upkeep you could try it. Be ready to accept the fact and financial cost, that you very well may end up having to have it fixed as best as can be done by a professional; should you make too many mistakes.
This type of service in my salon would take at least 4 hours, and even then I could not guarantee that you would be even half way close to what you want. To get the actual look you want without having to trash your hair will take months and months.
Should you still want to go ahead and try it, there are two application methods I recommend a full Highlight in a thin slice or weave. This will lighten a good majority of your hair, yet leave enough of the hair untouched by the lightener so as to maintain some kind of integrity in the finished feel of your hairstyle. OR you can lighten the entire head, but be ready for you scalp to literally hurt if you do too much to it chemically.
What ever you do, first take at least a 1/2" thick section of hair from the underside of your head, cut it off close to the scalp and tape it with duct tape. Perform a strand test on this swatch, write down exactly what you do to it, timing, formulas, processing tempuratures, EVERYTHING. Depending on how it goes, you will know what you can do to the hair on your head. If it looks bad, it will be even worse on your head.
If it looks great, tone with a Demi or a Semi Permanent haircolor product, no permanent haircolors on lightened hair. Any more questions, let me know. 
------------- American Board Certified Hair Color Specialist & Life Coach for the Beauty Industry
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