Try to use few frames (1 frame to 3 frames) for the punch and kick combos, add effects and stuff, try studying stick fights from other creators like herschel (flipanim user) he's really good.

Here's a good one. (he uses 70-80 speed)

Look at YeonAnim's (Youtube Channel) stuff, too https://www.youtube.com/watch?v=O-akvJ55b9c

Look at some of Hyun's tutorials.

No problem :)