A long time ago, I tried to learn how to draw; it was a hobby. The main rule I learned was, "To learn how to draw, you need to draw." This rule is incredibly simple but effective. There is no scenario in which a person diligently works on something for several years and doesn't become a professional in it.
Not everyone finds an audience—no one likes reading texts that are written just for the sake of writing. On the contrary, if the material is interesting and valuable, the number of readers will only grow over time.
I know Telegram communities that buy a lot of advertising, but no one reads them, and I know very few author channels that aren't advertised anywhere but still have a very high-quality audience.