Ask HN: Promoting your hobby site?

I've just "gone live" with my first real hobby site that other people might use (see https://news.ycombinator.com/item?id=10807094) and was wondering what others do to help promote their sites that they are not invested in full-time? I'm not looking to gain anything financially from the site but I do think it's something others might want to use.

Does it make sense to put any time/effort into promoting it or should I just let it occur naturally with the idea that if it's something people want to use, they'll use it?