Thomas,
Looking back at how this forum grew to its current state, in short, Nomad Gate found product-market fit for the PGV crowd, so once you established a critical mass of users on the platform, it took off organically.
Therefore, given that your resources are very limited, one approach would be to target program by program, user population by user population, searching for a group + program with a highly engaged user base that would benefit from this forum’s resources and design the further upgrades around that. The “next PGV”, so to say.
Perhaps nothing will equal PGV in terms of user base and engagement, especially since a lot of PGV’s engagement comes directly from its lengthy, complex, and dysfunctional process. But if you can find the product-market fit one or two more times, then that may be enough to diversify the site’s user base to the point that it will start to cover most all programs.
The current problem seems to be that 97% of the current user base is only interested in Portugal, and this may be because (guessing since I haven’t seen the analytics) 60%+ (?) of the user base is from the US, Canada, or UK, and despite the fact that PGV is dying, so far nothing has yet replaced PGV in the minds and hearts of most North Americans and Brits. So I would be pondering, how to attract more citizens of China, India, Russia, and Indonesia (and possibly to a lesser extent Philippines and Vietnam) to the site? Each of these countries has large out-migrating populations, and each likely has their favorite programs and ways of accessing them.
This then leads to the question of how to make the site multilingual, the first step being to launch different-language versions (Russian or Chinese first?), and further one thing that would be highly impactful is to integrate a ‘Translate post’ function similar to that found on Facebook or other sites. This would remove the linguistic barrier to non-native English speakers to read existing content, and likewise allow the current user base to interact with non-English content if/when you are able to attract a new user pool.
Personally, I would love to have more diversity of backgrounds and languages on this site, as different cultures have different ways of solving problems, and some of these issues that have been intractable to the current user base may have a better solution that a certain other group has already found.
Plus, why should a site focused on global mobility have only one language?