I created a yearly challenge for 2023. If I, or anybody else, want to repeat it in 2024, 25 etc., we would have to create a copy of that challenge. This means manually copying everything, and we would loose the books already added.

Instead, I would like to add another timeframe to an existing challenge, that matches the original timeframe. That way I could do a yearly challenge several times, others could do it in a year that suits them and we could still see all the books that have been added in previous years.