There is always something to do around the GNOME FreeBSD camp. Grab something that sounds interesting to you, and run with it.
Test existing ports, and report bugs.
Regularly install GNOME from packages, and report any problems with the install or the functionality.
Find GNOME applications not yet ported to FreeBSD, and work on porting them over.
Subscribe to the freebsd-gnome mailing list, and help answer users' questions.
Take patches and feedback from GNOME-related FreeBSD PRs back to GNOME authors so that the patches can be integrated into the next release of the application.
Proofread the FreeBSD GNOME project pages, and offer feedback and updates.
Send any feedback to freebsd-gnome@FreeBSD.org.