Thank you so much for going to the trouble! I think I figured out what I used to do:
I would turn the image b & w and then bump up the contrast. Then, I would make another project, but MUCH larger. Then I would copy the image, paste it into the new project and stretch the image to fit the new project. Enlarging it in this way really smooths out the edges, so typically if you bump up the contrast AGAIN, you're good, but if it's particularly tiny and pixelated like the image attached, you can use the blur blend and then run it through the brightness/ contrast again. Renders a very nice, smoothed out project.
Thank you so much for chiming in and taking the time to dispense your expertise!