> out of many pages of answers only few see one upvote a year^. I helped mostly specific people, not the common knowledge.
I regularly come across helpful answers on SO with 0 or 1 upvotes, so I wouldn't judge your contributions' impact solely on that. You've likely helped many people with your answers, even if there's no proof of it.
My answers usually did have some upvotes, and I’m only speaking of up-per-year here (passive accumulation after “hot” period, which kind of must show the real usefulness against initial “hey okay cool +5” phase), i.e. not 0->1->2 transitions.
But I see what you mean. Maybe I’m self-biased since I’m usually logged in and do upvote low-voted answers when they obviously help me. Majority may simply not do that for old answers and/or others questions. Still, lack of feedback makes things foggy.
I regularly come across helpful answers on SO with 0 or 1 upvotes, so I wouldn't judge your contributions' impact solely on that. You've likely helped many people with your answers, even if there's no proof of it.