Interesting to see this one flower without leaves. My bougies first grow a bunch of leaves, then flower...
This one is quite old, and of course full of green leaves in the spring/summer; but then in the fall after getting a good trim...
Only flowers!
Not only flowers (in fact
bracts, which as you well know are modified or specialised colourful leaves, with the function of attracting pollinators).
Perhaps putting yours near a white wall can help, as they do in Mykonos (they thrive over there);
See:
"Bougainvillea needs at least 6 hours of full sun a day to flower profusely and look its best. This plant loves the heat too. No enough sun = not enough color. If you live where it’s borderline zones hardy, planting a bougainvillea against a warm wall will help."