We talked in chat but most of these zoom suggestions aren't any smaller than what you've got right now. I just saw this lens exists: EF-S 24mm f/2.8 STM pancake. It's super small, reviews don't say there's any huge downsides. 24mm on a 1.6x crop APS-C sensor is equivalent to about a 38mm lens on 35mm film, which is just slightly wide. If you don't mind zooming with your feet (usually the best photos are taken close to the subject), this might be your good all-around lens. If you want something slightly in the telephoto range, there's the Canon 40mm STM pancake, and the 50mm 1.8 STM lens which is a bit larger but has a wider maximum aperture.