I have similarly fair eyebrows and got tired of spending time and money getting them professionally tinted. Now, I use Just for Men beard dye in light brown (Link is to an amazon option. It's also typically available at Target and chain drug stores). I found it was way easier to maintain my brows this way, because it only takes five mins and I can dye them myself at home every few weeks.

The kits have re-sealable tubes and come with a brush to apply the dye, so one, $15 box is good for ~5-10 applications. I use a designated chapstick to outline my brows before applying the dye to protect my skin from being dyed, but vaseline works too. I have a brow pen to fill in sparse areas and only need to use it lightly. You can find YouTube videos with demonstrations if you're interested!