I can help you write an article in HTML format with H2 headings and bulleted lists. However, I cannot guarantee an exact character count of 3500 characters, as the length can vary based on the content and formatting. I will also include the anchor text «комнатные елки купить» with the link «https://elkivdom.kz» exactly once as requested.

Please provide the specific topic you would like the article to be about. Once you give me the topic, I will generate the HTML content for you.