Without knowing more its really hard to say. You probably dont want to post more details without linking/naming your product as that always feels a bit spammy. Details like product type, geography, who you are targeting, what budgets do you expect to work with, is anything currently working/not, whats is the general price point, do you have any promotions, what life stage is your business etc.
Otherwise the answer is buy ads, send emails and go to trade shows, call key contacts... which I'm guessing isn't too helpful.