I seem to have a problem with moderating myself when it comes to playtime on Video Games, How do you keep yourself from just endlessly playing games?
Do you play games, or do you play a game endlessly. If it's games then it might be easier to sprinkle other activities into the mix like learning to play a musical instrument, etc. If it's a game, especially if it's a live service game, MMO, hatch's, etc, then they might have successfully tapped into "your formula", in which case if recommend dropping the game entirely. Games like that are specifically designed to keep you playing indefinitely.
Source: I'm a former Destiny addict.