Allow readers to purchase your own products or donate to your cause through your blog. If you have an online store for selling arts and crafts, or you create T-shirt designs available through a clothing website, provide links to those sites. Including a PayPal button for quick, safe purchases or donations is a common way to monetize creative blogs, or blogs that provide free advice or assistance to those who can't afford it.
If you aren’t part of an ad network then you are constantly searching for new companies to advertise on your site. This one was always a pain in the ass for me. I wanted to spend time making my site better, but if I ignored selling my ad space then I wouldn’t have money to continue to make my site better. You can join an ad network, but that means you are giving up a percentage of the revenue. Work hard to only get 50% of the money? Bleh.
Have in-depth knowledge in your niche? Package it up into an ebook and sell it on your blog. I'd generally advise against selling it (at least exclusively) on Amazon or Kobo, as you'll probably be able to charge much less. If you've already built up a solid audience, you can probably change anywhere from $5 for a very short one, all the way up to $39+.
To all the bloggers out there…STOP sucking up to the very small, elite and narcissistic group of self-proclaimed influencers out there. If you all stop treating them like they’re special, they will not longer by special and therefore some of us who aren’t in there secret society will be seen as knowing what we’re talking about too! This isn’t High School, grow up and read someone else’s blog already!