First of all, write a simple and attractive title. Use keywords that will help your ad be found faster. Put yourself in the buyer's shoes and think about what he will write when he searches for a similar thing or service on the site.
Take and add only high-quality photographs. Before shooting, put the items you are going to sell in order. Shoot in good lighting. The main photo should be the best of all.
The description of the product or service should be detailed, understandable and to the point. Divide the text into paragraphs. Describe everything positive about the product or service. Make active use of the built-in editor. Don't forget that information in two languages increases the number of potential buyers.
Check the price of okidoki for similar products or services. Don't set your expectations too high. Accept that in most cases, you will not be able to sell things at the price at which you bought them. If you want to sell things quickly, reduce the price.
For a small fee you can make your ad more noticeable and different from others. Even small investments bring tangible results. To see this for yourself, you can compare the viewing statistics of a regular ad and an ad with additional services.
To insure yourself against problems, use a deposit. A deposit removes any risks associated with receiving the goods and payment.
Haven't been able to sell a product or attract attention to a service for a long time? Change your ad based on the knowledge you now have.