What advertising method to choose for the target audience in the form of industrial enterprises?

Question

Internet advertising

Briefly about the project:
Search service for customers and contractors of industrial products. Information about the industrial enterprise (executor) and the technological processes that it performs is entered into the system. The customer, at his request, receives a list of enterprises that perform a full range of necessary technical services. processes, taking into account the size of the enterprise and the search region.
Now the initial filling of call center operators (in the database of more than 1000) enterprises is being carried out, in parallel a portal is being created.
To speed up the entry of enterprises and the recruitment of the primary user base, we decided to advertise with a link to the landing (for the time being, it weighs as a stub, instead of the portal being created), where the company has the opportunity to tell about itself and be included in the database.
Where is the best place to advertise? Contextual advertising gives a small output, since there are few keywords, the target audience is not large according to the wordstat. It is necessary to reach the target audience - industrial enterprises. Monitoring of large industrial sites or directories did not bring much tangible benefit. What can you advise?
There is a database with contacts of enterprises, on which the call center operates, including email. Is it worth doing a mass mailing by email with an offer to provide detailed information about yourself to enterprises or will it be regarded as spam?

Answer 1

Yes, it’s worth doing a mailing list
And taking information from the websites of enterprises, the enterprises themselves will not fill out anything, they don’t need to

Answer 2

It is worth testing all channels. and mailing and contextual advertising on the search and on topics. sites, and even more so retargeting. And then you can already in the social. networks and make advertising narrowly targeted.

Answer 3

Yes, it is worth doing mass mailings. To date, I believe that this is the best and fastest way to advertise. Personally, I use the services of the StandartMedia.ru service and do not almost regret my choice.