You don't mention a partner so I assume you re single . My husband and me had a couple of shorter breaks over the years but it was possible as we had another person's wage coming in .
In saying that we had no stache.
It also depends on your age , the older you are ( 50 plus) the harder it gets to find another job after a break .
If you are very young , I would wait until you have a few years experience .
Otherwise if you budget correctly and it won't affect your overall FIRE plans , why not ?
However you need to plan what you are trying to achieve from your break ?
Lastly and most importantly ( to me anyway) , can you change your life right now to NOT be in a rut ?
Try different activities , develop new hobbies , and basically prioritise life outside of work ?