It really depends on your niche; you have to think about it from the viewer's perspective.
Are your shorts in a niche that allows easy insertion of affiliate links? i.e., Pets where you could insert affiliate links for whatever pet-related, etc.
People who watch shorts usually don't look at the description unless the short visually tells them to go there; they just scroll down.
Content rewards would be a good place to start. From there, depending on your niche and after some thinking from the viewer's perspective, you could branch into other avenues.