Looking for tech conference speakers

What is a good way to target tech professionals and invite them over to an overseas tech conference as speakers? We are interested in bringing folks from OpenAI or from similar AI companies to a conference in Asia in May. Cold reaching out over LinkedIn isn’t helping much. We are not a globally known conference like RISE, Disrupt, QCon, WebSummit… etc. So, even if we offer airfare… etc it is still a hard sell in cold reach outs and the odds of convincing people has been hard. TC before quitting the employer: 350K. 11YOE