Just my two cents, but I would say that if you want to do it now, do it VERY soon, before December. Christmas is such a crazy time with so many voices competing, that your promo is likely to get lost, especially as you’re not a shop or similar service that has direct holiday relevance. But don’t do it right after the holidays either, when everyone suddenly stops spending and has holiday fatigue. February is a good time to launch new things again, I feel, because it’s a kind of dead point and it’s been winter for so long a lot of people are spending much time indoors, sick of the cold and dark, and desperate for something exciting. That’s how I see it, anyway!