Judged from the writing of the whole essay, your english is not bad. If you put a little more attention when you were writing, the error should be avoided.

1. Cherish your health (same as time) is important.
We may say: It is important to cherish your health.

2. Human have instinctive of love and to be loved.
Will it be better: It is human's instinct to love and to get love.

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