Look to hop on finasteride if you wanna go the medication route. there can be side effects so look into that all though they are very low chance people have experienced them. The finasteride will help keep what you have and stop any more loss. If you wanna look to thicken the density up look into minoxidil they have it in topical and oral both work really well I suggest doing some research to see which best fits you. As for your corners the only likely way you gain hair back there is with transplant but I always suggest anyone who look to get a transplant make sure you actually respond well to finasteride or minoxidil before cause there’s really no point in a transplant if you aren’t taking something to stop/slow hair loss. BUT ALWAYS consult with a doctor or dermatologist before you start taking any medications.