Question

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My hobby has changed my personality and my life. I become more responsible, patient and learned to focus on one thing. With the help of my hobby, I finally feel free.
So, I think that hobbi is not waste of time.
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Answer 1

My hobby has changed my personality and my life. I (have) become more responsible and patient; I have learned to focus on one thing. With the help of my hobby, I finally feel free.

So, I think that (a) hobby is not (a) waste of time.