I'm sure whether we should omit the first 'it' in this sentence >> for the best use, (of it) we have to buy it every year. Thank you for your time.
It's a little awkward without rewording. For the best use of it, we have to buy it every year. ) For its best use, we have to buy it annually.
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It's a little awkward without rewording.
For the best use of it, we have to buy it every year. (Usually, its name would occur once.)
For its best use, we have to buy it annually. (A little better.)
For the best results, we must buy it annually. (My preference.)