This is my second time hitting a heavy bag. Can you guys please let me know what can i do to kick better? Been training for about 3 months

What the fuck do i do with my arms? Should they stay up when i kick? Do i move them at all to get better momentum/hip rotation? fucking arms, how do they work

From what i gather
-more movement on the "non-kicking" foot
-my back should be straight
-more hip movement

https://youtube.com/shorts/tWGv6hk0bHc

appreciate your help. Thanks