Enter the phrase "translation agency" to Yandex or Google and you will see how many answers will be found. Cost per click on the word "translation agency" or "technical translation" even making 3000 minus words - parasites, is at least $10 (this is a price for a quality ads in terms of search engine).
As a result, the share of advertising through context advertising is decreasing in absolute determination, at the same time the share of context advertising in overall marketing budget increases. Context advertising should be based on your actual capabilities and repeat all that has already been written on your website.
How to promote translation services in the face of such fierce competition and excess supply? Create something new.
Look at your website as if you were a translation agency client. Find what you think may be helpful to the client and make emphasis on this. For example, you have a good algorithm for calculating the cost of translation of different file formats. Create an online form for online pricing calculation.
Or you have medical interpreters in stuff, which in itself is rare. Write about it on the site and make an emphasis on medical translation.
If you are strong in law - offer additional services and linguists consultations. Consultations related to the mentality of the country`s legal system will be in demand for many businessmen, emerging new markets.
Do you have a good programmer or webmaster who can deal with "disassembly-assembly" program resources? Write a software localization section on your website.