You can just draw with simple ideas. In this case I put numbers and equations randomly on a page. Then by extending some of the lines, and by adding stuff, I’m drawing until an image is suggested.
This kind of play is vital and helps your creativity. This solves the problem of wanting to draw but having no subject. Sometimes you have a strong desire to draw but the subject evades you. Or the subject is disconnected somehow. This also allows you to channel some love into line, line for its own sake, or color; the love of the elements themselves. I love a really good line, I enjoy carving the line into the paper. This is a way in, so you are not stopped by not having a subject. Maybe the subject is drawing.
What is stopping you? Find a detour around it.