Well if multiple species from different planets are going to be using your power system that means it probably can’t be tied to biology or something that can be done on a single planet.
When it comes to space magic I think that the thing that comes to mind first would be the force. It’s pretty much vague space wizard magic that can be molded to be pretty much whatever the plot demands of it, but at it’s core it’s a pretty simple power to understand. If you’re going to go with a softer magic system though just be careful how you use it. A good general rule of thumb is that the less your audience knows about the magic system the less you can use it to solve problems.
Since this is sci-fi you could also look to technology to build the magic. I feel like a cool place to start would be to ask what do you want the magic system to do and what are the magic’s limitations? Since I’m guessing this is more of an action series you’ll want your magic to be good at causing damage. What is a drawback to damage causing? Maybe using the magic costs something from the user, like some sort of hard to find resource??