I did henna in the past. It looks nice, but it is a permanent dye, so it's the same commitment. And it can't really be covered with chemical eyes so it needs to grow out.I have this too. Relates to a pretty bad health anxiety related breakdown over the span of 2 years . I hate having to keep dying my hair. Iv started using toner on it as i have balayage.
I have heard of henna hair dye which seems to add colour to your hair rather than strip it but haven't done enough research yet.
Toner and also the root spray sound nice!