
You mean the website of your instance? You can use LeechblockNG (https://github.com/proginosko/LeechBlockNG, https://addons.mozilla.org/en-US/firefox/addon/leechblock-ng/)
If your GrapheneOS build still includes Digital Wellbeing, you can use that to limit daily usage of specific apps. It is found in the system settings.
That has been Vance too outside of the US.