How fun! Great job with the site!!
I'll throw three suggestions out at you and someone else can pick up from there.
#1 Take a look at
Google Adsense. You have a beautiful opportunity to generate some income by placing Google ads on your website.
All adsense is is a feed that displays Google Ads in a variety of ways on your websites... and Google will actually read your page and provide ads related to the content.
You will make money when people click on those ads. The odds of them clicking is very high because they are related to your content.
You have a lot of flexibility creating them. They can blend in with the surroundings. You have the ability to customize them.
#2 What did you do?? Did you do all the research and put this website together yourself? How did you do it? What was the process?...
Do you think you could write out that process? Could you create a step by step guide to doing it?
If you can, there is another stream of income for you. Chances are the people hitting your website are interested in doing what you did. They might want to do it with their family. They might be very interested in the process...
So you could create a basic 10-15 page report or even a full blown eBook...
And then the next step would be to offer it on that site to all your visitors...
#3 You've missed out on a great opportunity these last few years! Find a way to capture e-mail addresses. Start a monthly or quarterly newsletter related to the topic.
By doing this you create a nice list that you can find ways to market to and make some extra change.
------------
Just a few things off the top of my head.
You are in a wonderful place. The foundation is laid... and you haven't even tapped it's potential. You can drive even more traffic there as well.
Good Luck!