Women prefer men who handsome, or rich, and if could, combination of both. But in fact men who are not handsome, or not rich, or even not handsome and not rich, can getting married too.
Frankly, this is the first time I hear a MALE cannot get married just because he is bald. If my sibling hear it he would laugh out loudly. He is bald, and he has a beautiful wife!.
If your friend rejected just because he is bald, just leave those immature women and find a woman who mentally mature. For woman who mentally mature, male physical appearance is not the main factor in her consideration.
For mentally mature women, character, which includes confidence, and sense of responsibility are the main factor in their consideration.
People in my place say "the world is not as small as moringa leaf. There are many other women". As long as your friend is not a shallow man who measure women only by physical beauty, Insha Allah, someone will accept him as husband.
But like I've said, improve your friend confidence. If he still believe that he cannot get married because he is bald, it's means he has no enough confidence.