When I wanted to break that routine I asked my mom to put a parental lock on the TV.
Even though TV showed jo channel for me I still lied down in front of it, twiddled with remote. Sometimes for many minutes. My dumb brain gradually learned that TV is not fun anymore (not that it was much fun in the first place).
I think similar mechanism might help you shake off your app addiction.
Not sure if this tool does this but maybe you could even have you fake facebook app show you static screenshot of facebook and let you scroll up and down a bit. You might have additional twists like scrolling locking up after few minutes forcing you to abandon or restart. Or maybe screenshot might be blurred a bit.
The real Facebook for sure does this!
The disturbing part is that even weeks later, if I am really bored I will reach for my phone and pick it up. There just isn't much to do on there anymore, so I put it down. I think I'm going to start leaving it places altogether so I lose the habit of having it on my at all times.
You could root the device and redirect reddit and hn domains to 127.0.0.1 with /etc/hosts file (does android have that).
By installing the fake app, you'll be surprised how many times you unconsciously you open them, although you are aware that they are fake apps. It feels like our brain is on auto-pilot, once we're hooked/addicted to unconsciously open addictive apps.
Uninstalling can just leave you searching for the app before you remember.
I don't really know if it will help any more than just uninstalling but I suppose for some it could.