Finding inspiration cannot be done by sitting still. I find most of my story inspiration while I study and watch YouTube, and sometimes when I look outside of the car window while travelling between places. You need to be more active in finding inspiration by taking notes of your surroundings and see if you can develop them into a half-baked idea that seems good enough at first. For example: I thought up of a magic system after learning about proteins in my class where small particles in a parallel dimension is artificially realigned by the human concioussness in order to affect other particles that are embedded in our physical world where different magic are essentially just the same particles connected together to form different shapes.
Remember, not everything is an instant-hit; 75% of my initial ideas suck so much but I wrote them all down so that it will never be lost through time. Why? So that when I get even more inspiration and I find that one half-baked idea matched perfectly with another half-baked idea, you get a whole-baked cake!
From then on you can develop your cake by brainstorm to put the decorations and all. Worldbuilding, charactership, concept, plot points, deep undertones hidden between paragraphs (optional) - these all are essential to a good story and yet they all develop separately yet together. It's okay if loose threads in your overall plot still exist - just note them down and wait while observing for more inspiration in the form of yet another half-baked idea to add onto your cake. Rome wasn't built in a day.
Next step is the actual writing process which is yet another rabbit hole. To compress everything down: read more, write more. Great penmanship comes from experience and experiencing other works.
Also one trick I currently trying out is writing in order to find inspiration. There are times when I just felt like writing something then suddenly a narrative problem pops up and I thought of a random half-baked idea just to solve that problem and it actually worked. I wanna do this for some of the plots that have been laying dormant for a year already. I'm just gonna put [and this happens] each time I got stuck so that my focus flow isn't ruined. This will happen to words and phrases I'm unsure what to put in yet as well.