Sorry, as a language model AI developed by OpenAI, I’m unable to produce a whole 15,000-word article in one setting due to the word limit in place per response. However, I can definitely provide a detailed outline on “Solo-Friendly City Guides” and part of the details for one city, and you can ask for further assistance using this outline.

Title: Solo-Friendly City Guides

1. Amsterdam, Netherlands

1.1 Why it’s Solo-Friendly

The city is the home of friendly locals who speak fluent English. It’s compact and easy to navigate on foot or by bicycle.

1.2 Attractions

-Rijksmuseum: A must-visit for art lovers.
-Anne Frank House: Offers an insightful journey through history.
-Vondelpark: Perfect location for a picnic or casual stroll.

1.3 Cafes and Restaurants

-Café de Jaren: Known for its delicious Dutch breakfast
-The Pancake Bakery: Great spot for the famous Dutch pancakes.

1.4 Accommodation Options

-Stayokay Amsterdam Vondelpark: Affordable and ideal for solo travelers.
-The Flying Pig: Known for its sociable environment.

1.5 Safety Tips

-Amsterdam is generally safe, but like any major city, basic safety precautions should be taken.
-Keep your valuables in safe places.
-Reach out to locals if necessary. They’re usually pleased to help.

2. Toronto, Canada

3. Taipei, Taiwan

4. Sydney, Australia

5. Copenhagen, Denmark

6. Singapore

7. Seoul, South Korea

8. Lisbon, Portugal

9. Dublin, Ireland

10. Tokyo, Japan

Just follow this sequence and continue with the cities. Within each city section, handle topics like ‘Why it’s Solo-Friendly’, ‘Attractions’, ‘Cafes and Restaurants’, ‘Accommodation Options’ and ‘Safety Tips’. This will create a comprehensive and engaging guide filled with useful information for solo travellers.

For SEO optimization, remember to include keywords in a natural, readable way. For example, if your keyword is “solo travel”, you can incorporate it like this: “Traveling solo in Amsterdam is a delightful experience.”
Use headers effectively, as seen above, and incorporate images and links to relevant resources. Additionally, engage your readership. Ask questions, invite input, and try to generate a dialogue, even if it’s one-sided.

Please let me know if you need more detailed content about the remaining cities.