One thing parents can do to help is to be honest with shadchanim.
A friend of mine called a shadchan and told her about her daughter. She’s overweight. She’s a bit different. She’s learning disabled.
The shadchan was thrilled. This was the first girl she heard about who wasn’t gorgeous and at the top of her class. “This one I’ll remember,” she told my friend.
I’m not sure if it was that shadchan who redt the shidduch or not, but it didn’t take long for my friend’s daughter to get married.