"Marketing" and "promotion" are too general words. In essense it means sending some messages (deals) to clients.

Who is the client?

1) Forgers. They need DPOS stuff done before any communications.
2) Merchants. They need BitseedsCoinbox stuff done before any communications.

And I still think that KILLER APP, app on the custom blockchain -  is the thing which will create flow of interest into XCR and cool market cap. For example, torrents! Image torrents datebase app, p2p app, like thepiratebay, integrated (plugged) in wallet as a module, build on one of the custom blockchains. The market of torrent users is much wider than the whole crypto market! Image that people, never heard of bitcoin, will use crypti wallet + torrent app first, and only then discover cryptocurrencies, forging, that forging takes only 1000 XCR and that they can use those XCR to buy products from mechants who runs Bitseed's Coinboxes. Cool ? Cool!