Email capture combined with email automation. I use Welcome Mat by Sumome for the former and Mailchimp for the latter.
Facebook - create different ads and test, test, test. If you properly target your audience, this could be a very efficient way to get high quality traffic and conversions.
SEO: little things matter. Your titles, meta desc, image alt tags. Same for pages and collections. It takes more effort upfront but pays dividends perpetually.
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