How to monetize the loyal core of the application?

Question

Monetization

There is an android utility app. Every tenth installation brings a loyal user who uses the application every day, that is, the life cycle is very long. The application has one function - to turn off the phone, and, of course, it is activated when a person turns off the device. It is clear that there is no one to show banners here, and if you leave them on the screen until the next turn on, I suspect that this will annoy users. the banner in the settings is useless, they are actually changed only a couple of times during installation.
There is a paid version of the application with extended functionality for owners with hardware buttons, but the free version is enough for almost everyone.
From my own ideas - paid visual effects of screen shading, and a limit on the number of free app launches per day. But it is not clear whether this will give a result.
I'd love to hear what other options there are.

Answer 1

1. Can add the possibility of some custom gesture for blocking? Or replacing a swipe with taps or something like that
2. Add a button with the ability to donate? :-)
3. Add a feature of this type that, for example, when you swipe to block, a menu is displayed like when you use the camera and there is an opportunity to make auto blocking at a specified interval, well, of course, the default is instant blocking and do it somehow nice and comfortable. And you can think about some other conditions / blocking modes. And by the way, you can do for each activation from some side of the screen.
4. Add the possibility of remote blocking.
5. Leave it as it is and let people use it, and later it will probably be a more convenient application for monetization, and this will serve as an advertisement / calling card? :-)