'How to choose proper radius for a map in leaflet?

I'm trying to make a map by leaflet in R. The attribute data as radius for the circle is discrete from 1 to 3500. I use simple way to scale it:

radius = Points$attribute/100

but as the figure shows, some cities are too large to overlap, while some are too small.

is there any nice way to scale data for the radius?

r leaflet icons scale radius

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