A horrible decision to make, but PLEASE don't invest all your payout into your own business, coz *if* it doesn't turn out as you dreamt then you have no nest egg to fall back on.
NOW is also the time you need to double check with your bank that you have income protection on your mortgage and/or apply for it while still employed....
Clearly you dont wanna start losing everything after making a poor investment decision with your payout.
IF anything, start looking for the next job already, THEN start doing deeper research & analysis of your dream job.
just my 2c
MM.