I've been writing my hobby novel for 10 years. That's how I got good. Everything I written in the first 8 years is unreadable now, that's the pace of improvement. I should note the book is not even in English. Good and clear writing is transferable across languages (As GPT-4 has shown...)
Fiction writing has been a unimaginable boon to my life, both career and happiness wise. Writing about a hacker made me try learning coding, and the clarity of communication helped me ace interviews. That being said, I didn't seek out to a 'writer', I merely wanted to bring my story to life, whatever it took.
Now that AI will actually bring the story to life, I spent the last 6 months learning every bit about AI, faster than any learning I've done before, because its pure joy.