Little advice

So I just got a 4 star sunspot
But I already have a max out 3 star sunspot. I ranked up my 4 star sunspot to rank 2 and I don't know what should I do? Should I keep ranking my 4 star sunspot, or do something with my 3 star sunspot. Any advice would help, thanks.

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Comments
3 stars will only take you so far
Think of it as a passing of the baton