What should I do before writing a book to gain some reputation?

I will definitely write a book at some point in my life, probably in 3–4 years. I can’t do it now because I’m still mastering that skill.

However, I do have a lot of knowledge about that skill. Not enough to write a book, but more than enough to write articles online about that topic.

I was thinking about opening the account on Quora, and answering the questions which are in my field. At the end of the answer, I will put a signature with a link to my personal website, which I’m also planning to open.

Any suggestions whether this is a good idea or not? Should I create account on any other platform? Or do something else in addition to this?

Thank you for your answer.