Adding missing dates each category for a kpi dashboard

Create a date calendar table and join date with that date. Then use the option to display 0 data rows and filter visual where value =0.

When you put in visual use the date from date table.

To get the best of the time intelligence function. Make sure you have a date calendar and it has been marked as the date in model view. Also, join it with the date column of your fact/s. Refer :
https://radacad.com/creating-calendar-table-in-power-bi-using-dax-functions
https://www.archerpoint.com/blog/Posts/creating-date-table-power-bi
https://www.sqlbi.com/articles/creating-a-simple-date-table-in-dax/