Infographics are currently an extremely popular type of media. An infographic showing information or data in an interesting and fun way can help engage an audience and generate numerous likes and shares. As infographics take more time to create than just simply uploading an image, busy website owners are prepared to pay for custom infographics. And don’t worry, an infographic can be created using simple design software such a Canva. So extensive graphic design skills are not necessary, just a creative eye.
Now as to your comment on traffic it is true, traffic is important. But the truth is, acquiring traffic is easier than converting it. Plus we have many posts dedicated to traffic generation on this blog. Simply check this post, this post or this post. But must importantly, the reason why people struggle with traffic is that they try to promote a sales page or a heavily biased piece of content. Nobody wants to share that, nobody wants to link to that, and as a result you don't get traffic and blame your lack of success on traffic (like you did in your comment above).
If you have a good idea for an app, and the skills to create it, then producing your own premium app can be profitable. However, with so many free apps available, it may be hard to convince people to pay. If you want to go down the premium app route, consider having a basic free version to encourage people to download the app in the first place. You can then provide the option of upgrading to a premium plan once users realize how useful the app is.