The best replacement for neem is tea tree oil.

The best alternatives to neem are rated as following:
★★★★★  tea tree oil
★★★★★  margosa
★★★  azamax
★★★  tea tree
★★  moringa

Your alternative for neem is not listed? Suggest!
Speaking about neem, one probably shouldn't forget about tulsi.

Other search terms related to neem and their ratings are:
★★★★★ tulsi
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Google Trends

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neem
tea tree oil
margosa