Prior to that group, they had an online community for teachers looking for lesson plans. That probably sounds pretty random, but it's crazy the type of communities you can build and rally people around. If it's something that you're passionate about yourself and you want to connect with others that have that same passion, then an online community is something you should definitely consider.
I almost didn't list Swagbucks here because, while it's a great rewards site, they list in their terms that you can't expect for up to 10 days after you cash out. However, it's still an option to earn fast cash because some people report getting paid much faster than this. You can redeem you SB (Swagbucks) for Amazon codes, Paypal cash, and gift cards to popular merchandisers among other things. These points build up quickly thanks the the large number of things you can do on the site to earn. I've used this site and been paid many times.
How much will you make? I think my best month with Google AdSense was almost $5,000 over the last ten years. That amazing month blew my mind since it was actually near the beginning of my blogging journey. When you go from making zero to $5,000 in a month, that will rock your world. For me, it also got me even more excited because I knew there were other ways to monetize.