If you truly want to upgrade your language skills, then translation might not be the best way to do it, but you're really just playing around, so I believe that if you find it fun, then more power to you.
表現したいと思わないのに表現力を上げたいというのがそもそも矛盾しているからな。
息子にプレゼントを買ってあげたいんだ。何かいいアイディアはあるかい?
I'd like to buy a present for my son. Do you have any good ideas?