Things that have worked for us is basically focusing on basics -
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Write lots of topical content
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Think about the core user and write content to capture their entire decision making journey
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In depth, well researched content that will be used as a reference for others. Its fairly slow from link perspective but you get really high value links over time.
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Interlink content really well - keep it topical and meaningful.
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After few months, category pages will start to rank.