Amazfit Watch faces

I'm trying to modify a PipBoy watchface for the Mi Band 5, all I do is change the position on day and month so it goes DD. MM instead of MM. DD but when I compile the modified JSON I get this error:
"Fatal|[ERROR] Watchface is greater than 615kb, it will not be accepted by Mi Band 5, please ...

I'm trying to modify a PipBoy watchface for the Mi Band 5, all I do is change the position on day and month so it goes DD. MM instead of MM. DD but when I compile the modified JSON I get this error:
"Fatal|[ERROR] Watchface is greater than 615kb, it will not be accepted by Mi Band 5, please reduce ...