The best thing to do next would be to create! Go wild with your imagination and make a lot of art! Try to find ways to take high quality photos of the ones you are most proud of and turn that into a portfolio/look book that you could easily share with others. It's always important to self-promote and make sure you are sharing your art with others.
It is important for artists to use Instagram to both post your own art and as a way to connect with other artists. I have found that as an artist, building your network is extremely important for motivation, inspiration, and promotion. Artists love helping each other, but you need to put yourself out there to do that!
Hope this is a helpful start!