Hello Beniamin,
I hope you are well today.
In order to set limit per category, please follow the general steps below:
1. At first, please go to WooCommerce > Settings > Order Min/Max Amount > General. Now, set the Amount limits to Minimum and the Amount types to Sum.
2. Now go to the Products section and enable the Per product category option. This will add new settings fields to each product category edit page.
3. Finally, navigate to Products > Categories > Your Category > Edit and set Min sum to appropriate value.
I hope you found this information beneficial. If you have any other questions or need assistance, please contact me.
Kind regards,
Moshtafizur