Today I’ve put together an extremely short video on the new notify function, which alerts users to things they may not be aware of in the app. I’m not convinced that from an accessibility (low-vision users etc) point of view whether it will tick all the boxes, but it could be useful in the right circumstances, an may save you the trouble of creating, say, an ‘On Success’ page.
There a bit more on the function here https://docs.microsoft.com/en-us/powerapps/maker/canvas-apps/functions/function-showerror
and also a blog post by Greg Lindhorst https://powerapps.microsoft.com/en-us/blog/showerror-function-is-changing-its-name-to-notify-as-it-learns-some-new-tricks/
Good luck with this