I don't think more aggressive marketing would have helped much in this case. The exposure they got from that massive YouTube channel (7m subscribers), specifically targeted at high end nerd collectibles, was pretty much the pinnacle of exposure that I can think of, aside from buying commercials during actual Star trek shows (for those airings/streamings that have commercials), and it didn't do much to move the needle. I think the numbers are pretty maxed out. Also the TOS Enterprise suffered from being first in class-- now that it broke the ice and the Tomy ST line is now a well-known, proven property in the collector community, it made a world of difference in sales figs for this round, apart from the fact that the refit may have a significantly wider fanbase.
(that said, professionally produced tv/streaming commercials probably would've bumped the numbers nicely, tho the cost I imagine would be beyond exorbitant)