I think I agree with others' suggestions of simplification.
But one other thing I would like to mention is function. The way she dresses should be practical either to her role in the story or her character.
For example, wearing heels makes it harder for her to move around and run. Shorter heels might be more believable, or at least something that looks easier to move in - these ones would restrict the knees. It's possible for knee high boots to look more practical, like the ones you see in Attack On Titan for example. If there's a character-based reason why she wears those, like an emotional attachment to them, that would be an alternate function.
Maybe adding some elements that actually indicate her being a mage would help, too. I can tell you're going for a gothic style of dress so maybe something with runes on to tick both boxes. Runes are also easy to draw. You could put runes on her coat belt, her skirt... literally anywhere. You could even replace those bothersome laces with straps that have runes on them. Those would be far easier to draw and also more functional to the design.
I mean, Zatanna has been included here and everything she's wearing indicates her role as a magician - she looks like a showman from top to bottom. Also, she looks simple enough to be reproducable for multiple panels.
The wand is a good start, and so is the long coat for that mage vibe. However, it still feels like things are missing.
I think the skirt feels a bit randomly placed, too. While her boots and tube top have a kind of whimsical look to them as well as looking fashionable, the skirt just doesn't give off a vibe of magic or fashion. A good replacement would be a pencil skirt (a nice stretchy one to allow for movement) or maybe a shorter skirt with spat shorts underneath (more fashionable and modern, while also being easy to move around in). The skirt she has looks like it would get in the way of her legs while also looking very out-of-fashion.
This is definitely a strong start, though. You've got a tonne of great ideas going on. It just needs those slight tweaks to make it look more unique and memorable. You should be able to look at this character and say "ah yes, that's Astra!".
As for making her more memorable, maybe you could add some intrigue to her hair. It's both fashionable and practical to style your hair if it's long. She could wear it in a ponytail, or even have some braids to enhance her "mage" image. Braids are very whimsical and witchy. You could even dye streaks or other colours into her hair to add a quick and easy element of fashion to it.
Look into some witchy and high fantasy elements you could add that are unique or less common. That might be a good place to find inspiration. Look into things like wicca or hellenistic witchcraft, since they're more modern and an "urban sorceress" is more likely to look a little wiccan or hellenistic. Even looking up things on pinterest will give you plenty of image inspiration. Type in something like "witch" or "wicca" or "sorceress" to get some quick and simple visual stimulus. That's how I get my brain going when I'm designing a character. If you want, make a pinterest board of character inspiration. I have character boards that I use when drawing mine.