You’ll know when you’ve created a positive impact, because people will seek you out specficially. They will say things like “I thought of you as soon as I heard about this opportunity”. Maybe they will come to you for advice or your perspective on a topic. Take it as a sign that you are either engaging in too mch gossip or you have leadership qualities, and honesty that is unmatched. You energize people and give them a certain look (vibe) that they can not get from others around them.
Never try to become the guy or girl that people look to. This doesn’t work because it’s not authentic. Just be the best version of yourself that you can be, and see where that takes you. You can’t fake authenticity.