In the last couple of months I've been recovering from mild-to-moderate burnout symptoms myself, and a lot of how I've been doing that is playing The Witcher 3. It works. (It probably helps if the game you're playing is one of the most astonishing artistic creations of the last couple of years, to be fair.)
The big thing is this: you can't force it. One plausible explanation for burnout is that it's a defense mechanism from your subconscious against excessive delayed gratification: if you're very self-disciplined and work very hard on something that you think will give you rewards in the end, but doesn't whilst you're doing it, then don't get those rewards, after a while you start building up subconscious resistance to doing that again.
It sounds like you're not too long away from the death-march project. If so, just give it some more time of not trying to do things (counter-intuitive and often scary for highly motivated people, I know), and see how you're doing in a month or two.