Tips on filling in eyebrows evenly?

Qu

So my natural eyebrows were thick, then i got a trichotillomania disorder so now I have super thin unnatural eyebrows with patches. I don’t like arched brows so i fill them in straight, but today I can’t get them to look similar. I know they should be sister and not twins, but they aren’t even close to the same shape. Tips on filling them in better?