You can exchange your points for a variety of products or for Yuucho Pay Points on the YuYu Point website. In addition, you can use your points for shopping at the Japan Post Online Shop (JPN ver only).
You can also send YuYu Points to your family members.
<YuYu Point website>
https://site.jppt.pf.japanpost.jp/
<To send points to your family>
https://site.jppt.pf.japanpost.jp/my/transfer
<To exchange for Yuucho Pay Points>
https://site.jppt.pf.japanpost.jp/point-exchange/yuchopay/
<Japanpost online shop (JPN ver only) website>
https://www.shop.post.japanpost.jp/shop/