No, he just couldn't think of scenarios to focus on him
his character arc is basically done, he's not insecure anymore, there's nothing to develop or explore with chopper
only thing left is that he accomplish his dream, when the time comes for him to learn about a medicine that heal everything Oda will focus on him
Wich possibly can be very soon, the answer can be related to Kaido healing properties, Especially if Kaido is related to Vegapunk