Ierrech First Novel is a good novel to 'practice' to learn your style. This is why I use comedy to 'wrap' the bad style while getting better. Gwahahaha. (My Second Novel (not yet published) is my focused work).
Back to yours:
The cover is good.
The Title is WORST. Rebellion Against Fate is your title, that is not selling, but that is your brand. Feel proud of it. I use Endless Universes (and that 2 words didn't sell).
However, instead you add something not selling Magicless in Magic World.... Fist are enough. That is Synopsis.
What is selling in here is Naruto (or any other famous name), SEX (yes, this is the key to Top Rank), System (it is outdate...).
Unless you have the keywords, you will not get 'bonus' readers. So if you write your title as just "Rebellion Against Fate" you will get no benefit or no loss than current title.
Is the MC OP? Overpowered MC is popular. That is a better keyword to put on title, if after the MC got the power, she would become very very powerful. Like one punch man? If she isn't OP, do not use that keyword tho.
Perhaps "Magicless? I have my Fist!" "Magicless? I have OP Fist! - A Story of Overpowered Woman for example. (OP story is hard.)
The title is too long without selling keyword except "Magicless". <= This is unique but the rest isn't.
You have a good style with description better than me (I admit that). The problem is niche market, but your first readers and follower, must be you. Yourself, so write what you like else, you will be disappointed.