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I believe to succeed you will need to develop your own niche. For example, I read a lot of history, mystery novels from foreign lands. Currently, I'm reading a book about Bombay, this includes a developing mystery, a study of their present society, i.e. caste system and a strange religion that I never knew ever existed! This combination enlivens the reader and develops a loyal following. You have to try to stand out in a crowd and with peoples short attention span you have to capture them from the first paragraph.
Writing is a broad field. Depending on the type of writing you're open to, you can make decent to great money. As others have mentioned, there are the careers of reporter/journalist, playwright, technical writer, and novelist. Writing proposals for the Architectural/Engineering/Construction (A/E/C) industry pays very well. Knowing InDesign, in addition to having great writing and editing skills, will give you a boost in the A/E/C industry. You can also be a writer working in the public relations and/or marketing communications fields or even a grant writer.
There are many careers a person interested in writing can take. You can write plays, books,novels,screenplays,etc.
All you need is the determination and exhilaration to proceed.
Of course! It depends what type of writing you're willing and want to do. Especially in the era of digital, writers are needed in all sorts of fields. Some writing positions include digital and print marketing and advertising; technical writing; news, media and publishing; commercial writing for companies; blogging for businesses; playwriting or novelist and much more.
Writers often have to do writing work that just "pays the bills." That just means you'll find yourself occasionally writing about topics or in formats that aren't exactly aligned with your passions. That's OK. It's all about building your portfolio and expanding your skill set while pursuing other opportunities when they arise (and working on that novel on the side).
You might be lucky enough to have a full-time job writing, but many other writers have to cobble together several part-time positions or freelance work. You might even freelance in addition to your full-time job. There's no one-size-fits-all for writers and that's a good thing. It means you have plenty of options if you're willing to put in the time and effort it takes.