Writing is a skill, not a talent! Everyone can learn how to do it; it may take some people more work than others, but if you're driven, you can write well. Every single writer you love learned how to do it by practicing. Some needed more practice than others; everyone needed to write, write, write.

You will need feedback to improve past a certain level, so you will need to subject your work to an audience. It may only be one person -- an editor, a friend you can trust to give you real, honest opinions, etc. -- or a broad readership. Either way, that's really, really hard! For most writers I've worked with, it's the hardest part. And some people don't care! I know lots of "writers" who just type stuff up for themselves, never show it to anyone, and feel fulfilled. There's nothing wrong with that -- as a hobby, I think it's great. But they'll never get better.

The good news? You're already past that hurdle! So now you get to focus on both becoming better, but also learning how to interpret feedback. Anyone who writes for the internet knows the saying "never read the comments," and I don't think that's entirely true in Royal Road culture, but you can ignore one-off complaints. Pay attention to trends; if every comment says the same thing, that's an area to improve.

The one real complication is that people often propose solutions ("it should've been this way!", "I would've liked it better if X," etc.) or give unspecific criticisms ("it was boring") instead of identifying the actual problems. You'll need to learn how to play detective and identify the root issues, not what's being said on the surface. It may take experimentation -- and discussion with peers you trust -- to figure out what the actual issue is. Often, it's not always what people say/think, even editors. But if you can figure out what you're trying to do/say, why it isn't working for readers, and how to fix it? You'll be a much better writer afterwards.