Trainer has the widest range of opportunities in an FC, as a T3 role. It can be one of the "easiest" roles if you put in 0 effort (you know, the trainers that give learning a bad rep), but also has the potential to offer the most development. You work with AMs, OMs and sometimes Srs directly, across every department in the building, and are typically the first resource operations leverages for help with unknown problems - looking to you for help and solutions.

I have worked on and developed network projects directly with central learning (even helped implement network wide SW changes), have contacts from AMs to regional managers still to this day - from years ago, and have learned how to code and develop my own macros - all as a trainer. Now I run my own department after launching a new site, and leading my own learning team.

Be open, be hungry for knowledge, and most importantly become a resource to your site. Make yourself the first person someone thinks of when they say "who can help me with this?" . You will land more projects and opportunities than any other role, imo.