How to make my hairline even?

No easy way: Your hairline is something you don't have much control over. If you don't like that yours is uneven, the best course of action is to wear a hairstyle that looks good with the hairline or covers it up. There are not any medications or other treatments that would change it.

Either : Have your hair stylist for barber even it out. But if that's not possible then you would likely have to seek the help of a hair transplant specialist to surgically even out your hair line. The pills and other topicals will not work so well to even out a hair line