I just do my job to the best of my ability. If I can help a colleague I do. I don't expect to get explicitly credited for everything I do.
If my employer can't see or don't care about the value I bring, I simply go to one who values me higher. I refuse to participate in office politics and that kind of BS.
If you are employed, by definition you have outsourced the worries about the return on the value you create to your employer.