There is a great website called alternativeto.net. If you know one piece of software that is kind of what you want you search and it tells you similar other software. It has zillions of entries and does not seem to be over run with bot trash. I believe the recommendations are largely based on human responses. And I have never seen any affiliate codes or other commercial biases.
Here is a link for alternatives to SketchBook: https://alternativeto.net/software/autodesk-sketchbook/ You should select what platform you want (iOS or Android probably). You need to open the options by clicking this arrow:
and there are other options there you can select also. Hope it helps.