"It's better to read something better suited to your level."
"It's better to read something at your level."
"It's better to read~" 「〜を読むといいよ」"It's good to read ~" や "it's enough to read~" も使えます。
"something at your level." 「自分のレベルに合ったもの」
"at your level" 「自分のレベルに合った」
It might be better for you to read something that's more appropriate for someone with your reading skills.
この場合、次のような言い方ができますよ。
ーIt might be better for you to read something that's more appropriate for someone with your reading skills.
「もっとあなたのリーディングスキルに適したものを読んだ方がいいかも」
reading skills「読解力・読む能力」
ご参考まで！
You should read something at your level.
Try reading things at your current level.
It’s better to read material that matches your level.
Start with something a little easier and build up.
「自分のレベルに合ったものを読む」は英語だと at your level / your current level / matches your level が定番です。
オーストラリア 
カナダ 
アメリカ合衆国 
