How to keep lightened hair brown?

I dyed my hair months ago and long story short really messed it up. I’m naturally a light/medium brunette. To fix my hair my stylist had to lighten it and then toned over it with brown to match my natural. It looked great at the time but as I wash my hair the brown toner has faded, and now I look more like a dark... show more I dyed my hair months ago and long story short really messed it up. I’m naturally a light/medium brunette. To fix my hair my stylist had to lighten it and then toned over it with brown to match my natural. It looked great at the time but as I wash my hair the brown toner has faded, and now I look more like a dark blonde than a light brunette. Is there any at home treatment I can use to keep the brown tones in my hair as it grows out?
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