How to make pumelo (oriental grape fruit) to get sweet.

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Hello,
Would you please help to tell me what to do in order to make my pumelo to get sweet. My pumelos start to bear fruit about 5 years. The very first year. It was very sweet and then, last year plus 3, 4 years before that,. it was not . Secondly, what you recommend to spray to kill the fungus and foliage problem.
Thank you very much
Tai Nguyen
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