Increase subscriptions to my newsletter

I create a weekly newsletter about the automotive industry. It is well respected but only has a small subscriber base. I am looking to increase subscriber numbers, but only for relevant groups. The subscribers must be to business email addresses in the following categories: Automotive OEMs (companies that make cars) Automotive suppliers Venture capital companies investing in the automotive industry Start-ups in the automotive industry or mobility space The project is to create, and then run, a friendly introduction email with follow-up that adds quality subscribers -- I am also open to other methods of adding people that you suggest. I want to have a fixed price project that adds 500 subscribers and then if this is successful I would discuss an ongoing relationship. The targeting strategy is something we can discuss in more detail. It must also be sensible - so not just writing to CEOs of each company. it should be more like scraping details of conference attendees / article writers and then sending a targeted email along the lines of "since you wrote this, I thought you might be interested in this". Once again, the first stage target is 500 new subscribers to relevant business email addresses.