Write guest post
Be active in social media and share your ideas, steps towards your goal. For example, I am subscribed to one of the entrepreneurs of my city and he has an Instagram channel where he always posts good information about a business and his own steps. I can say with confidence, he influences people very well.
I think the best way is to make your experience a storytelling. Also show your self as an example, good person and passionate of what you are doing. The influence will be just a consequence of those behaviors.
I guess you just have to be creative, and outgoing in wa way, create an invitation card, or a presentation, be formal and straightforward. i think it depends on what you are approaching them for.