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Re:Show HN: I am Building a Producthunt alternative by ImPostingOnHN on Monday November 25, 2024 @05:04PM (#42240637)
I think you might be referring to the common american english idiom "next big thing", as "next best thing" means 2nd best in american english as well.

Note that "next bigGEST thing" also means the 2nd biggest thing.

Re:Show HN: I am Building a Producthunt alternative by mathgeek on Monday November 25, 2024 @05:13PM (#42240687)
This is the common usage in my experience (US).