Well, my first thought was possibly promoting it on the Bionicle subreddit. I've already put a post there, but I doubt it'll get far. The sub does have 17,500 members however, if even a few of them take a look and support then it'll probably help.
But really, anyone anywhere - amino, maskposting I guess, whatever. Heck, just tell anyone you think you could even convince to support it even if they don't care for Bionicle. Friends, family, whatever.