Writing is a craft. Writing is art. Though it seems simple to sit down behind a computer screen and press the buttons on a keyboard, it takes true skill and dedication to become proficient in entertaining readers with your writing.
The art and craft of writing cannot be picked up by anyone who has never seriously attempted to do storytelling before.
That said, like any art or craft, writing is a skill that can largely be trained and practiced to a proficient level.
I like to compare writing to other expressions of art such as painting or playing the piano. It takes years for painters and pianists to become skilled enough to reach the level of a professional, or at least someone who can earn the audience's appreciation.
Therefore, don't think that the low entry barrier of writing means that writing a good or entertaining story is also easy. It takes effort, creativity and skill to write a story that can do well on Webnovel or as a published book.
Just like any other form of art or craft, you can train your creative writing skill in a focused way.
You can read lots of good novels to train your story awareness.
You can start writing fanfiction, which is not only easier than writing an original story, but also allows you to shape your writing style in a more tolerant setting. It is easier to attract readers if they are already fans of the characters you include in your story.
You can also buy books or watch online videos that teach you how to write a story. I believe Brandon Sanderson has a good lecture about this on YouTube.
Whatever method you choose, if you are truly serious about creative writing, then you need to realize that you have to put some serious effort into becoming good at it. After all, you can't expect a random stranger to become a good pianist in just a few weeks of practice, right?
While it doesn't take a decade or so for someone to become good enough to do well on Webnovel, in my opinion it does take at least a few months to a year to reach a point where earning money on this platform become viable. From the other original authors I've interacted with, I believe this is very much possible for anyone who is truly willing to commit to this craft.
Therefore, if you reach a point where you are seriously questioning whether its worthwhile to continue writing, you just need to consider whether you are motivated enough to work hard in raising your writing ability to an acceptable level. Anything possible as long as you have the passion in creative writing.