Ok here is probably something new and i am pretty sure maybe only a handful of domainers did this worldwide, if any. It will cost you some money and time and hours of walking. Plus, you need to be quite self-confident face2face. i.e. act like a real businessman. You can't do this with a pyjama and laptop from your bedroom.
Put on a suit, print some businesscards and attend big Fairs / Exhibitions of a specific industry, if you have a lot of domains related to that industry (or few premium category defining domains related to that industry).
In each exhibition stand you will find the important people of that specific company (i.e. managing director, marketing manager, etc.).
No Phone needed. No emails needed. No search needed. You have them all collected in one single place and you have the right and decision making person there to talk to. And you have companies with money. Such stands are not cheap.
I did this once in Germany back in 2008 and sold 3 domains in the x.xxx range. One directly in the fair (we signed the contract which i had prepared already in advance incl. NDA, etc.). And two later after i talked to the Marketing Managers there and we agreed to talk about this later. Note that many serious business don't want details of such sales to be published and specially not in a forum, etc. So prepare your sales contracts in a professional way and include NDA paragraphs, etc. This will make it more professional.
And my names were not one word premium names, etc. I had bought them all for reg fee and/or in the xx - low xxx range from snapservices.
In total i had about 400 dollars costs and made 5k win in two days.
Note: it will help if you know details about the specific industry (Hobby, jobs in the past, etc.), that way you can talk more about that industry, once you are having a conversation there with someone.
You will need to prepare yourself, practice such discussions, write down all possible question which could be asked and prepare your answers, practice in front of a mirror and/or with a relative/friend, etc.
Another great thing about such Exhibitions is that you collect hundreds of business cards from Marketing Managers, Managing Directors with exact details (direct phone, email. etc.), so later when you have other names or even later with the same names you had in the fair, you can contact them again via email.
Most of the people there are surprised about your offer, since probably they never experienced such an offer in any fair they attended (they probably only experienced a lot of email spam though!). So many (not all) are interested to sit down and listen to you.