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In periods I set my phone screen to grey-scale mode. It seem to make apps like Insta a bit less interesting, at least for me. Worth a try!
I've done this (though got out the habit of using it)
You can set it quite quickly too and bind it to a triple-click of the power button
Navigate to General > Accessibility
Find Accessibility Shortcut at the bottom of the screen
Open it, set it to Color Filters
In periods I set my phone screen to grey-scale mode. It seem to make apps like Insta a bit less interesting, at least for me. Worth a try!