You seem to be in the lucky position of not having to work to make ends meet financially. Lucky you!
So, because this is not entirely about money the answer - and reason for that answer - is likely to be both personal and unique to you. I suspect that you may already know deep down the answer to your own question. So it is time to get interested in yourself and ask yourself some questions to get that answer out. I would be asking myself:-
What will I get out of going back to work? (List every single benefit you can think of, not just financial, and rack your brains for a few more besides)
What will it 'cost' me to go back to work (same as above - get anything and everything you can think of out)
Write down your answers. Try hard not to attach any judgement to your answers, be really really honest (and know that you can destroy the evidence when need be that is what shredders are for!)
Look at your 2 lists. Sleep on them. In the morning ask yourself the following question:-
If it was 6 months from now and I had made the right decision, what would my week be like? How would I be feeling? Who would I be seeing? What would I be doing? How would I know that I had made the right decision for me?
I don't know if this helps but hope it does and wish you lots of luck. Trust yourself to make the right decision for you