Topics for articles can be chosen based on your expertise. Based on your niche you can develop interesting titles and the content for the article. For instance if you are good at writing parental care or baby care, you can start with good title and publish it online.
Once you begin to receive response from the readers or there are more number of page views for your article, you can develop content and article on the same topic and start writing interesting articles for the benefit of readers. The more you publish the better will be your online presence and soon you will be identified as an expert in a particular topic.
For example if you have gained good expertise in writing baby care articles, you can further extend it by writing baby care products, baby care and needs and further parental care. This will bring the interest of audience and soon you will be offering most satisfying services to customers.
But there should be consistent and good effort in developing interesting and new informative content that invites the interest of readers. Read articles online and make sure that your article is different in title and also in information.
Once you have met the needs of readers online, you will be successful as online article writer and you will be able to gain good online reputation for your success. But helping customers with their queries and giving a good advice will also establish you as a successful writer and this works to your benefit.