A couple of things to maybe help you out a bit: 

1-Try not to make them too long. I enjoy action, but when it goes on for several chapters (or a whole chapter depending on chapter length), and it’s not a big final battle or something important, sometimes I just get bored. Honestly, even if it’s the final battle sometimes I just get bored when the payoff isn’t done well enough. And it’s not that I don’t like action, I do, but he punches, she punches, he ducks, she jumps, powers here, powers there… I need dialogue, story! Just action for too long is tiring. 

2-Which brings me into my second point, make sure the plot and dialogue continue into the action. I can take a lot more action if there’s a conversation going on at the same time. Or, if it’s the final battle and there are high stakes, building tension and all that. 

3-Use a combination of short and long paragraphs to get pacing right. Me and many other novice authors at one point thought action meant fast pacing, faster, faster, and accomplished this through short and fast paragraphs. But this can take away from a scene. Instead try longer paragraph and use one liners or shorter paragraphs to accentuate important bits. 

4-Make sure your audience knows who is who. There is nothing more frustrating in a fight scene then not knowing who threw the punch. I know it’s scary, the idea you’ll overuse a character’s name. And it’s a very real possibility, but at the end of the day, repetitive name calling is less frustrating than straight up confusion. But, if you really want to avoid the name game, you can play around with things like powersets, if one character fights exclusively with say fire power, well, I know the fireball didn’t come from the water witch! 

5-If an injury isn’t life threatening, if it isn’t bad enough for a character to freeze or turn the tides of battle, don’t pause for it. Mention the hit, sure, maybe the pain, maybe even a tiny mention of blood. But don’t stop to describe the full on injury, that can wait until after the battle, when the character’s have time to actually look down at themselves and see what they just went through.