A small amount of Google AdSense (<$100 monthly.) Sortable makes up the vast majority - https://sortable.com/ . Switching from only-AdSense to almost-entirely-Sortable is what made me able to afford to live off the site's revenue: my earnings doubled overnight.

I suggest you look into Header Bidding, you're leaving tons of cash on the table by going all in on just one demand partner.

Sortable does header bidding.

What are your recommendations for other firms?

I believe they do header bidding for their own demand, but you can squeeze more revenue out of your traffic if you learn to manage your own headerbidding stack. Take a look at prebid.org and checkout the r/adops reddit. You might find some inspiration there.

Thanks, I'll check those out.

Recommend Publir:

https://publir.com

Thanks, very interesting!