Take a long shower. Get a full night sleep. Take a sabbatical for as long as you need. Relax until you're bored. Then do whatever gives you joy. Then figure out

Take a long shower. Get a full night sleep. Take a sabbatical for as long as you need. Relax until you're bored. Then do whatever gives you joy. Then figure out if its your work (that is line of work etc), working conditions or something else that lead to your burn out. Make a plan to guardrail against it. Personally for me, I need to take at least 1 personal day / 3 day weekend every month otherwise I start hating my work. I also need to take at least a week on a relaxing vacation (not sightseeing / running around doing stuff for a week!!) about every 6-8 months. I also try to work on _my_ schedule the best I can. I like to work from about 8am to 2pm and then some amount between 10pm-2am; for whatever reason those are my best working hours. Take as much time as you can to learn to listen to your body because I really think you can catch burnout before it reaches meltdown. I haven't had a proper burnout since 2016. Best of luck my friend.