Dyeing Hair Gray?

I stripped my dyed hair once with color fix stripper and then bleached it. My underlying color was a red tone with about an inch of salt and pepper colored roots. I then used Wella t18 toner and the color was lightest ash blond. I now have snow white roots and still have some light strawberry blonde areas where the old color was. All was done in one day.

I have used deep conditioner twice, regular conditioner, and I used coconut oil overnight before any process and after stripping and again overnight after bleach and then toner. I'm to the next day and hate my hair. I am going for a gray color. I can't afford a salon at this time. I have been off work for 5 months and will return to work in 4 days. How can I get the brassy color out and make it gray before I return to work. I am desperate for a quick reply! Thank you in advance.