To bring out some writer's perspective, I myself was originally only good at description and character interactions. I was bad at writing dialogue and only slightly above average at writing battle scenes.
What changed me was competition. I was writing fanfiction at the time, and seeing others rake up these great favorite/follower counts made me a TAAAAD bit jealous. And amusingly enough, if one threw out a dozen average chapters, they could actually surpass the subscriber count of someone who wrote well. But I didn't know that. I just wanted to become better at writing.
So, I asked a friend of mine who had this kind of OOMPH to his fight scenes to teach me some secrets. He taught me a few tricks, and I researched other fight scenes and picked up a few of my own. I got a lot of good feedback on my fight scenes afterwards.
I think that if we hold our art to an impossible standard(the fixed "perfect story/art idea" that we have in our minds), we start to get afraid of the process of learning and making mistakes. And if we get scared of learning and making mistakes, we never learn. That said, I am still really bad with learning from critique - mostly because I'm my own worst critic. XD I have to work on that.
It should also go without saying that I am here because of those hours I spent writing the other stories. It is only now that I think I can write the story of my dreams, because I practiced so much. If a person lacks the drive to learn, I would recommend starting a passion project. Wanting to get that passion project to as good a level as possible will FORCE YOU to learn and pick up new stuff, even if you feel a little overwhelmed by it.
I don't mean to sound preachy here, my words are mostly directed towards someone who's on the cusp of starting a comic of their own or something. I certainly like to see up-and-comers take their place among us writers and artists. Anyway, naive rant over.