This is the most important decision in your career (or even your day).
It didn't used to be. What next used to be a question answered by your boss or your clients.
With so many opportunities and so many constraints, successfully picking what to do next is your moment of highest leverage. It deserves more time and attention than most people give it.
If you're not willing to face the abyss of choice, you will almost certainly not spend enough time dancing with opportunity.