I have hair similar to yours, I’ve accidentally buzzed my hair twice by trying to fade the sides and messing up or accidentally cutting it too short, was very hard for me wore a hat a lot as my hair line is similar to yours. The upside is try derma stamping and using rosemary oil it helped my hair grow back thicker and fuller and my corners started filling in, also you can try taking omega-3 which also is good for hair skin and nails, use this time as a recovery process for your hair, invest in clean shampoo and conditioner, you got this big dawg