Not technically "Accessibility" but Android has a "developer" setting called "Show Touches" which puts little dots on screen when you touch it.
I find it acts a little like being able to see the cursor on a desktop or laptop; it provides a little bit of immediate feedback that the system recognized your intent, and helps make it clear whether it's the OS or just the app when things are getting laggy.
Under "Display & Text Size": "on/off labels" and "increase contrast". "Reduce transparency" is a bit of a mixed bag but is worth trying out.
Under "Audio & Visual", "background sounds" is a built-in 'white noise' generator and can be useful for relaxing / sleeping. You wouldn't want to leave it on all the time, of course.
Under "Touch": "Back Touch" lets you map a double/triple tap on the back of the phone to various actions.
There's a lot of other neat features in iOS Accessibility (eye-tracking control! automatic captions! sound recognition!) and I'd encourage you to poke around to see what's available.
I love the background sounds feature. You can add a shortcut in the control center to turn it on and off. I used it a ton when I lived in an apartment with particularly noisy neighbors
As for Reduce Transparency, next iOS version has a proper slider to adjust the transparency of Liquid Glass - worth playing with for anyone on the beta
Bit of a niche, but I use inverted colors and the camera app to find ticks on my dog. Enabled by triple-clicking the lock button under Settings -> Accessibility -> Accessibility Shortcut -> Classic invert
I find it acts a little like being able to see the cursor on a desktop or laptop; it provides a little bit of immediate feedback that the system recognized your intent, and helps make it clear whether it's the OS or just the app when things are getting laggy.