There are several levels of criticism in writing. It's hard to deconstruct the good criticism, and sometimes much harder when you want to get something from the bad criticism. One criterion that could help sort out this mess is to feel out your readers. Are they liking it? Well, you can ask them to rate your story and the aggregate should return decent numbers. Even Primal Hunter has an average rating of 4.55, which is quite high, even though it is one of the most criticized stories among the most famous LitRPGs. So, ratings, especially when you aggregate them with followers, can go beyond the vanity metrics they usually are.
What makes no sense, often, is to listen to professional critics. Or reviews. Reviews are written by people who either liked or disliked your story, but they often don't really know why that is.
If you want to get better at anything, you need consistent practice over a long period of time. It doesn't matter whether you are talented or not, going at it every day for multiple hours a day will, in time, make you a better writer. Especially in the indie scene, there's much more criticism than any normal writer can take. It is true, though, that It's better to take criticism from fans than critics in their ivory towers.