What would you do with the time? Would you work a part time job? Start a contracting or consulting business? Enjoy time with your kids?
My suggestion would be to stop viewing the FI threshold as some sort of life changing event. You won't suddenly check your bank account one day, realize you're over the threshold, and suddenly feel fulfilled and free of your need to work. In fact, I can tell you from experience that it's a bit of a non-event.
I suggest you continue working until you have some idea of what else to do. Leaving your job is technically fine if you're truly past the FI threshold, but only if you have something else to do. You'll fine that there are a lot of hours to fill in a week without a job.
Traveling can be great, but unfortunately filling year after year with travel is likely to greatly increase your spending. Ironically, this can actually move you back under the FI threshold for a lot of people. It's a common mistake to calculate FIRE thresholds based on frugal spending when you're occupied by a job all week, neglecting the fact that you're going to be spending more, not less, in early retirement.
I encourage you to do your best to live a satisfying and fulfilling life. However you want to do that is up to you. If it were me, I'd use the time to leave some sort of legacy behind for after I kick the bucket.
Personally, I once took a year off in my mid-20s and realized that without external requirements I tend to just sort of laze about. Did some random things but nothing really focused even in terms of personal growth. So if I achieved FI I would simply find a job that I find fulfilling and is low-stress. Maybe work for a non-profit for some small salary. Or consult with startups for equity since that tends to not require as much commitment. I feel regular consulting for money requires too much hustle and client management.