It's not necessarily that I practiced for hours every day, but it's very disappointing.
「毎日何時間も練習していたわけではないがとても残念だ。」は英語で「It's not necessarily that I practiced for hours every day, but it's very disappointing.」という意味があります。
毎日何時間も練習していたーI practiced for hours every day.
わけではないーIt’s not the case that・It’s not necessarily that
残念ーToo bad・Disappointing