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1 and/or 3. not 2. if there is a lot of volume and its competitive keywords, #3 would help you build sites that are more focused on specific topics (which are ranking well now). Note that this is harder to manage/maintain and will have a larger investment in marketing than option 1. I also think you should have 1 "corporate/umbrella" website that does what your option 1 says which links to your option 3 sites. Hopefully you can have both sites ranking for your terms.