Maybe if it instead was "post 3 weeks in a row x amount of times"? And have 4 weeks count as 2, 5 weeks as 3 etc.
That way you would only lose two weeks of progress if you take a break while in a streak.
Could maybe also allow two consecutive week breaks before it breaks the combo. This would allow people to post only once every one, two, or three weeks as they please, but still give incentive to post every week since it makes the combo increase faster.
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