Check out this article I wrote for BiggerPockets.
4 Smart Ways to Overhaul Your Outdated Landlording (& Boost and Profit!)
The main points are that you should:
1. Focusing on a niche and move away from Craigslist
2. Tap into your ancillary income opportunities
3. Exercise your civic leadership
4. Experiment with one unit – split test
There are lots of ways to operate – traditional landlording is the least profitable way of all the options.