As someone 4+ months into one can say this:
You need to have a specific goal/plan on what you will do largely in the unstructured time. For me it started with working on physical health, and it really helped to stay sane on track. Could be traveling, retreats etc.
You can't force yourself to reflect and come out with clarity in a specific timeframe. You just meander through things, activities you would love to do, be mindful, talk to friends, colleagues etc and somewhere things will hit you.
Returning to work with me job could be a whole hit or miss drama that will take time and patience, so ensure you have more runway than just the period you think of.
Also inflation is real and depending on festive/sale month etc, your monthly expense may have been more than you planned for, so adjust your calculations runway accordingly.
Lastly a possibility is that you just need a break and time off, so try asking for an unpaid leave for 1-2 months and use it to travel, spend more time with family etc. A lot of your views on your current role, manager, company etc will get clearer and it's possible there only few small things to address for you to be back working contently.
P.s. I took a break that I pondered for almost an year, to address rock bottom fitness, energy levels and get clarity on my career wants for the long term (20+ years).