For users who joined iNat because they already cared about wildlife/nature and preserving the natural world, participation in iNat will hardly have radically altered that. I believe @DianaStuder mentioned the threads about ethical herping because they are examples of how people are considering the potential impact of their actions/behaviors (flipping logs) on the welfare of the animals affected.
There probably isn’t a lot that most of us can do to help wildlife/promote biodiversity through direct everyday actions (apart from e.g., things like changing our gardening practices, but you have already made it clear that you are not particularly interested in urban nature or small organisms like insects). For me in urban central Europe, truly wild spaces are far away. Apart from some few local initiatives, most things that I can do that would have a meaningful impact are lifestyle choices and donating to organizations that are involved with nature protection and sustainable development projects. None of this directly relates to my activities on iNat.