How to increase fiber output power of LED array

There are 7 LEDs in TO39 packages with an outer diameter of 9.5 mm. Each LED has a lens at the light exit port, and after passing through the lens, the beam divergence half-angle is 7°. It is desired to couple the light from all 7 LEDs into a fiber bundle with a diameter of 2.5 mm. The fiber bundle consists of 93 uniformly distributed fiber cores, each with a diameter of 0.1 mm, and each fiber has a numerical aperture (NA) of 0.22. What is the best approach to maximize the coupling efficiency of the light from these 7 LEDs into the fiber bundle?