I already moved away from the reddit app, but now I have the problem that I can not set up time-based constraints that don't block the rest of the browser.
I've used NextDNS.io in the past and setup schedules to block the reddit domain during work hours.
The problem that I found is that sometimes it's not just a place of procrastination but the place you want to search for a useful answer to your question.
Some apps like ScreenZen allow you to block websites, if you're on Android. Pretty much any iOS app will let you restrict websites (because it's easier to implement there).