Congratulations on your BLT purchase,

Home, and

to the boards.
First, to get the most days at BLT book a standard view. Some standard view are parking lot view, but there are some that have views of MK and the fireworks. Depending on the season, BLT Standard view is less expensive than other resorts.
If possible, visit during the low point seasons. NOTE: these are busy seasons for
DVC, so I would suggest booking 11 months out if possible.
Another tip, Friday and Saturday nights are the most expensive. If traveling for fewer than 5 days, you could avoid those nights altogether.
Also, just because you own at BLT doesn't mean you can't book at less point expensive resorts. OKW is a great value for points and is often available at the 7 month window.
For us, we have opted for split stays so far. We try to book other resorts for the Friday+Saturday, then book BLT starting on Sunday.
Hopefully others will mention other tips.