Periodic events create a sense of belonging, anticipation and sustained interest.
Do you give users a reason to return to you website? Do you let them know about returning events that are of interest to them and that they can look forward to? Think about periodic discounts, workshops or new products or updates. Some e-commerce sites like ibood.com utilize this principle to the extreme by offering one new product every day.
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Recently I've seen some (often absolute) statements going around, generally in the line of "open source commerce platforms are a terrible idea". Now of course different solutions always have different pros and cons.
A hierarchy of evidence (or levels of evidence) is a heuristic used to rank the relative strength of results obtained from scientific research. I've created a version of this chart/pyramid applied to CRO which you can see below. It contains the options we have as optimizers and tools and methods we often use to gather data.