Sorry, as a language AI model developed by OpenAI, I’m not capable of producing a full 15000-word article at once due to a maximum token limit in a single output of around 2048 tokens or roughly 1024 words. However, I can give you a series of well-developed points which you can further expand to meet your requirement.

1. Structure and Stability: Despite the freedom and flexibility that comes with freelancing, it can also be a source of unpredictability. A set daily routine provides a structure that freelancers can rely on, fostering a sense of stability and normalcy amidst the uncertainty. When freelancers establish a routine, they create a secure base from which they can tackle their various creative projects with increased focus and productivity.

2. Improved Time Management: A sunrise jog or a cup of coffee at 8 AM might not seem related to freelancing efforts. However, these activities form a crucial part of a daily routine that helps manage time effectively. Freelancers, due to the absence of the usual 9-5 office timings, often have to juggle multiple tasks at different times of the day. This makes time management an essential skill, a skill that a solid daily routine nurtures.

3. Control and Accountability: Setting a routine helps freelancers take control of their time and work. It ensures that they are the ones driving their schedules, not the other way around. Control over time boosts self-confidence and a sense of accountability towards meeting deadlines, ultimately enhancing performance and output quality.

4. Consistency and Productivity: Routine drives consistency. When freelancers commit to a specific work schedule, they enable a consistent work output, thereby promoting reliability in their service delivery. Over time, routine-led consistency fosters a behavioural change that significantly improves productivity.

5. Boost Creativity and Inspiration: Routine may seem contrary to the spontaneous nature of creativity. However, many groundbreaking artists testify to the power of routine in sparking creativity. By creating a structure where they regularly engage in creative work, freelancers pave the way for inspiration to strike rather than waiting for it passively.

6. Reducing Procrastination and Overwhelm: A routine structures the day into defined tasks and periods, limiting opportunities for procrastination. It also allows freelancers to tackle larger tasks in smaller, more manageable chunks, preventing feelings of being overwhelmed.

7. Health and Well-being: A daily routine can also be beneficial for a freelancer’s physical and mental health. By ensuring sufficient time for rest, healthy eating, exercising regularly, freelance professionals can maintain a balanced lifestyle. This promotes overall well-being, which positively impacts their work quality, productivity, and satisfaction.

8. Work-Life Balance: The blending of work and personal life is a common freelance challenge. This can lead to burnout and dissatisfaction. Keeping a solid daily routine where work hours and personal time are clearly defined and respected ensures a balanced and fulfilling life.

9. Professional Growth: Routine can free up time for learning and skills development. Freelancers can schedule dedicated slots in their day for up-skilling and continuous learning, which can enhance their expertise, portfolio, and market value in the long run.

10. Stress Management: Having control over the day’s activities provides a sense of calm and certainty, reducing stress. By routinely taking time for relaxation activities like taking walks, performing yoga, or meditation, freelancers can effectively manage stress, a common issue within freelancing careers.

To transform the above points into a 15000-word article, each point needs to be expanded into about 1500 words. This expansion can be achieved by including personal anecdotes, research-backed facts, expert quotes, actionable advice, and relevant examples for each point.

To make the article SEO-optimized, be sure to perform keyword research and integrate those keywords organically in the headings, subheadings, and content. Also, provide links to relevant and authoritative sources to improve your SEO score.

For a well-structured and easy-to-read content, use headers, bullet points, lists, and short paragraphs. Be sure to check the readability score using tools like Hemingway Editor or Grammarly.