How to get the crunchy shells

So I finally was able to bake macarons that had the “melt in your mouth feel” after constantly dishing out batches that were sticky and chewy. The macarons I make now are great in texture but the shells are soft, not as crunchy as you’d want to be at all. I bake it in my convection oven for 10 minutes (in the temperature as shown in the picture). What should I do?

by Ora-ora-kun