KDP (Kindle eBooks): $200-$300 monthly from a handful of books selling @ $0.99 to $2.99 each.
Google AdSense: About $550 per month from 11 niche websites each earning about $50 per month.
Amazon Associates: $550 to $750 per month (used to be much higher) promoting products on niche websites and two authority sites.
These three took A LOT of time (about 2 years) to build, monetize, etc. These days they're mostly passive income so I'm happy for that. It's funny- looking back now I realize that I could have built everything much faster had I known what I know now, but whatever
Main income streams (where the serious money is):
Promoting affiliate offers to email subscribers: $7,500 to $12,500. Guys, this is where the money is at. I promise. Not being biased just because it's worked for me or anything like that. I've tried every money making method out there, and as far as hourly rate, effort, initial investments, etc are concerned, this is the best route to take. Just build a landing page, bring in traffic (free or paid, I prefer paid), and build your list. You need to have good email marketing skills though (just watch a bunch of YouTube videos on it and you should be fine).
Coaching 1-on-1: $2,000 to $3,000 per month. again, offered through my email list. build enough credibility and this becomes easy.
I've dabbled in flipping websites but kinda sucked at it never tried MLM or anything like that either. My biggest turning point came when I invested $2,500 in soloads a few years back. It was close to all the money I had at the time. Over the course of 2-3 months, I had 5,000 subscribers, most highly targeted. I made my money back quick promoting affiliate offers. Occasionally, I get paid to write blog posts, sales pages, and other copywriting stuff too.
My main message? Burn the boats. Sounds cheesy, but seriously- you've got to be willing to sacrifice any short-term comfort now for any long-term success you may experience. It's the only way. "You can't focus on Plan A if you have a Plan B"...that sort of stuff. Anyway, thanks for reading. Good luck in your own endeavors guys.