A quiet fortnight feels like a verdict. Often it is a calendar. Knowing the normal shape of demand keeps you from reacting to weather as though it were climate.
The working week is the strongest pattern
Most buyers here are building something for work or for a client, so they browse on working days. Weekends are consistently quieter, and a Sunday with no sales means nothing at all.
Year end and year start move differently
Late December is slow almost everywhere: budgets are spent and nobody starts a project. January is the opposite, because new budgets and new plans arrive together. An item launched on the twentieth of December is launched into the worst two weeks of the year.
Category matters more than the calendar
Anything tied to a seasonal business follows that business, not the general pattern. Booking systems for tourism pick up before the season, not during it, because owners buy when they are preparing rather than when they are busy.
Platform releases create their own spikes
A major version of a framework or CMS sends people looking for compatible items. Being early with a compatibility update is worth more than most features.
What to do with this
Judge an item over a quarter, not a fortnight. Ship updates before the busy period rather than during it. And do not cut your price in the second week of a quiet December.