Handle your edges gently
Another way to restore your hairline is to treat your edges with extra care. The hairs around the hairline tend to be the weakest so one wrong move could lead to breakage easily.
You could try laying down your hairline with your fingers instead of brushing through with a comb, for example. If you comb or blow-dry, do it gently around that area instead of roughly forcing the comb to pass through. Also, use soft protective hair scarves made of silk or satin that are gentle on your hairline.
Try a growth serum and balms
Hair growth serums and balms can help your hair grow back healthier. Usually, depending on the product, you will need to massage it on a clean scalp daily or a couple of times a week.
Another alternative is nutrient rich oils like castor oil and peppermint oil. Research on the right combinations you can mix together or buy a bottle straight from the store that has the best properties.
Try restoration treatments
When the hair loss is severe, there is a very low chance that other solutions will work. This is the point where you have tried every other method but still, your hairline won't grow back.
There are a couple of options you could try like hair transplant where hair will be extracted from the back of your head and implanted on your hairline. This is a more permanent solution that has great results.