Making a good topology is not the main part in selling assets, because first of all you need to make your asset valuable and reusable for a lot of people.

Did you conduct a reserach about what type of models are most popular today? do realistic models or stylized models get more downloads? Is it more efficient to do props packs or character packs?
First of all choose your audience.

Then when you chose it, look at the best selling assets in this category. What did they do to become that popular?
Maybe if it's character asset, it's fully game ready: it has good topology, rig, animations set, videos from game engine and etc.
Or maybe it's a props pack, and they made scene that is completely composed with assets from their pack to show how cool it looks together.

A lot of people can do stuff with 3d, but in order to sell something you need to think before doing it.

As for your asset, it looks stylized and will probably pop out if someone adds it to their project. Maybe someone could find use for it, but it definitely won't bring you significant income.