Monitize blog with 15k/users monthly (nische: online dating)

Hi!

I'm brainstorming ways to monitize one blog that I am working on in the online dating nische. It have 15k users monthly coming through SEO traffic.

The visitors mostly use Tinder and are beteween 25-35 years old. We've tried selling a e-book with limited success.

The affiliate program we are running now is doing okay, but not great (ads for other dating sites).

Any suggestions on what to sell these 30 something singles looking for love?