I'm going to tell you something that may be "against the grain" so to speak. My advice is not to "just relax" or "take a break" or "approach your job more casually" or anything akin to that. My advice is to divert your activity into the aspect of your job that attracted you to it in the first place.
The reason I say that is that folks who are "burned out" are often overburdened not with just "work" but the drudgery aspects of their job -- i. e. the worst part of an otherwise cool and exciting occupation. Taking a vacation from the job, IMO, reinforces the idea that what you've chosen to do with your life has lost its ability to contribute satisfaction to you. Sometimes that may be unavoidable. Maybe you've chosen something that simply won't provide you what you need anymore. But I'm hoping -- and betting -- that that's not the case. That you really can turn this around. And looking for what excited you in the first place is the way to go.
This sort of approach may require you to disappoint some people or change direction or be a bit more assertive about what you are willing to do. Or simply changing to another similar job at another company.
The idea is that if you're talking about something that you've spent a lot of time and effort and hopes and dreams into, don't give up on it. Give it a chance to fulfill its promise to you. You may end up changing direction entirely, but don't give up. Make it deliver the satisfaction and fun you always expected it to. After all, you gave a lot to your job -- your job should give some back, right? You might be pleasantly surprised.