If you have a normal relationship with work, no real hardline stress or trauma, then you absolutely should do whatever you feel like. For about a month.
Sleep until you wake up. Eat whenever. Live in your pajamas. Play games/watch tv/read/paint/play music... take a month long hiatus from being a "responsible adult."
After a month, you should start nudging yourself towards figuring out a basic, lowkey schedule for exercise, interaction, and things you want to do. You don't have to map out the rest your life at this point, but having some simple goals/purpose likely will be key for the next year.
Get a job with someplace that really matters to you, volunteer, work on your health (eating/exercise), find out if you really want to learn how to rock climb/play an instrument/travel/whatever...
But get going on stuff that excites you, makes you eager to wake up each day with a smile on your face. Don't vegetate for months.
It may take you months/years to find the rhythm to your own personal FIRE, but the fun part is, you can dance along to all the different melodies out there until one fits you.