How do I improve my dimensional accuracy

Right now my dimessninal accuracy is well withing the average but I want to see if I gmcan get it down to 0.1. I need to know what test print to do since calibration cubes arent consistent as in you can print a second one immediately after and it won't be the same with the same settings and fillament. I already calibrated my sesteps to my sprite ltobextrider and the reccomended baseline was perfect. As for the rest what other things should I be checking to dmbiost my da.