As others have said, I would recommend researching the excursions. With the excursions, I would also see if you can book directly with a third party. A lot of times you can book directly with the third party for the exact same excursion (e.g., you will be on the same excursion as those who booked with Disney). Of course it would be cheaper if you booked directly with the third party. I would also research Palo and Remy and determine if any of those fine dining options interest you.
Finally, before the PIF date, I would consider how you want to pay off your cruise. E.g., what CC to use to maximize your points. Alternatively, research if buying discounted GC is appropriate for you. Check to make sure your
Travel Agent accepts Disney GC for payments. Also you can look at the Budget Forum and look for the Discount Gift Card Thread (
https://www.disboards.com/threads/disney-gift-card-deals.2941964/) (Go to the last page) and be on the lookout for any discounts that would maximize your value. Alternatively, you can also find out which stores in the same thread that sell discount GC up front (e.g., BJ's, Sam's Club, etc.) With some time, you can be a little patient to find the best deals. You may think it's not worth it, but even with a straight 5% discount from BJ's, a $4000 cruise would be discounted to $3800 (that's $200 extra for souvenirs, excursions, etc.). Of course if you have to cancel, then you would get your refund back to the GC that you purchased. If you've researched what excursions you want to book with Disney, you can also figure out what additional GC you want to buy to bring with you on the trip and put on your on board account - this is how you will be charged (although you can clearly buy after the PIF date to put in your on board account).
You probably already know about both of these (as these are generic to most cruises):
If you haven't purchased
travel insurance, you should look for it now. Some of the key dates are initial deposit, and paid in full date. Initial deposit has already passed, but the paid in full date hasn't. E.g., some benefits will be available if you book before the paid in full date.
Also, you should begin looking at flights in the next couple of months (if applicable). I would also book your hotels now provided that they have reasonable cancellation policies. You can then shop for better deals as you get closer.