Best marketing mthods of eCommerce business

What would be the best marketing methods of eCommerce business from your extensive experience ? Make a ratings if possible. And of course to combine the methods is common thing, just try to give them separately.
1-Google Ads, 2-Forums Ads, 3-mails, 4- Phone call (directly), 5- FB, 6-Twitter, 7-Platforms (Amazon, Shopify, etc), 8- (more from you)

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