If your characters actually fight in any martial arts-style or inspired, then it will help you understand more about martial art moves for both inspiration and to not be so inaccurate that your character just lose their flavour. You dont need to fully nerd out in the subject, but you should at least pick a style and watch some movements and fights and try to replicate them within your character's personality (Avatar is a good example of real martial arts + magic).
If you are just going for magic, fantasy moves, you can look for movies and series that have good fight scenes (regardless if you like them or not; I actually have found good inspiration for fight scenes in genres I didn't like. You are looking here for the visuals and logic behind the fight more than the plot). You can look specific for some fights plot twist or impressive/surprising scenes and try to understand why they feel that way and replicate those in your story context.
Your characters personality also can affect the way they fight, if they move faster than others, or more cautious than others, or more brute or smart.
The context and reasoning behind why the fight is happening will also affect the rhythm of it. Is this fight meant for the hero(es) to have a character development turning point? Is this fight meant for the villain to prove themselves too strong?
These considerations may determine if you need to make your hero or villain win by far, or if you have to balance between winning and losing moves among your characters.
You will have to think of moves that are meant to be a bad losing move and moves that are meant to win or overcome that move. You will have to go synchronizing these chain of movements until you reach the climax or ending point of the battle. Its something like win, lose, win, lose. For your battle to not look "stupid", you will have to go fooling the reader that a move will actually work out when you as the author already knows that the rival will overcome that move. If you are out of inspiration, then take the time to watch good fight scenes and try to look for these "rythms" and replicate them with your characters powers. You will get the hang of it and naturally start finding creative moves yourself.