There are a number of ways to promote yourself as an artist...
There are those who use sites like Patreon to create a steady income stream, where people pay a small subscription fee to see your latest works, or get perks for funding your art.
Another suggestion is to find any local galleries, libraries, art communities, and get involved. If you can create art in support of a cause that can promote your work as well.
Depending on what type of art you produce, you might also be able to segue into commercial art (e.g. graphic design, advertisements, etc.) or into a field like gaming or comics.