You guys are both going through the same stage of development and growth... so there is little you can do other than the obvious to help them grow any better than they already are. The emotional support of having a friend who is all-in like you seem to be speaks volumes and can not be understated; that is super important. But also helping with any projects that may have in a supplementary role (like filming, acting etc) can be extremely valuable as well. You can work together to promote each other by collaborating on projects, there is value in your helping each other. But there is not a specific thing that you can do in order to change the trajectory of their growth.