直訳したら、「I practice singing very hard」になりますが、英語の考え方で、「singer」になろうとしているので、「singing」以外を練習しているならおかしいでしょう。もちろん「singing」を練習するでしょう。だから、「practice singing」と「to become a singer」を同じ文章に使いません。
「to become a singer」の「to」は「ため」という意味です。「in order to」も使えますが、「to」だけ使う場合は多いです。
「熱心に」は「fervently」「enthusiastically」などでもいいし、「I practice night and day」などでもいいです。
I practice singing with a lot of enthusiasm in order to become a singer in the future.
最初の部分は "I practice singing with a lot of enthusiasm"を書いている。これは翻訳すれば、「私は歌う練習を熱心にしています」という意味です。
そして、"in order to become a singer" は「歌手になるように」を指す。
最後の部分は "in the future" は「将来」という意味です。
英文は別の言い方ですけど日本語に翻訳すれば、「将来歌手になるように歌う練習を熱心にしています。」です。
Because I would like to be a singer, I practice extremely hard.
I train my voice all the time because I hope to become a singer
I practice very hard everyday so that I can become a singer.
The above phrases are answers to the question "Why do you practice your singing so much." These answers are both for during a conversation and when you are being interviewed. This means that you can use these phrases wherever you are asked this question.
上に示したフレーズは、"Why do you practice your singing so much?"（何でそんなに歌を練習するの？）への答えです。どちらのフレーズも、会話と面接の両方で使うことができます。つまり、この質問をされた場合は、どんな場面でもこれらのフレーズが使えるということです。
I practice singing very hard so i can become a singer
I want to become a singer so practice extremely hard
You can use the words 'very' or 'extremely' to express that you are doing something and trying very hard to do it
To practice means to keeps doing something until you get good at it
So you would practice singing to become a singer
I am always at singing practice because I want to be a professional singer
I practice singing everyday because I want to become a singer
I work hard at honing my singing skills because I want to be a professional singer
When you want to explain that you work very hard at practicing your singing because you want to become a (professional) singer; then you may explain it in the following ways:
-I am always at singing practice because I want to be a professional singer
-I practice singing everyday because I want to become a singer
-I work hard at honing my singing skills because I want to be a professional singer
（プロの）歌手になりたいので一生懸命歌の練習をしていると伝える言い方です：
-I am always at singing practice because I want to be a professional singer
（プロの歌手になりたいので、いつも歌の練習をしています。）
-I practice singing everyday because I want to become a singer
（プロの歌手になりたいので、毎日歌の練習をしています。）
-I work hard at honing my singing skills because I want to be a professional singer
（プロの歌手になりたいので、一生懸命歌唱力を磨いています。）
I dedicate myself to singing so that I will master it.
I devote myself to singing so that I become proficient.
Dedicate' and 'devote' both mean 'to give one's all to something.' To 'become proficient' means to 'develop a high level of skill.' To 'master' means at least 10,000 hours of practice.
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