In the past, I have offered a variety of benefits to the sites I am contacting. Here are a few I can think of off the top of my head:
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Relevant and original blogs or articles
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sharing their site or advertisement on social media profile
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writing a testimonial for businesses or individuals that I have worked with
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"how-to" articles
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Infographics or visual guides
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Bringing typos or broken links to webmaster's attention
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A reciprocal link