WordPress also have a variety of plugins that make it easy to put social sharing buttons on your blog posts. Some people like to limit the number of plugins they use on their WordPress blog because it can slow the blog down and it can open your blog up to more attacks, butt a social sharing plugin is one that should have high priority if you do choose to use plugins.
Email is a great way to deliver other forms of content. With Convertkit, I am able to also create free email courses that can automatically be sent out to my subscribers. This makes life easy because all a reader has to do is sign up, and then Convertkit sends out all the information that they need and drips out the content day by day (or whatever timeframe I choose).
If your niche doesn’t allow you to promote or build premium products (anything over around $100 per unit) then think about getting a solid mix of offerings and building it up over time. I remember Darren Rowse saying that initially Amazon Associates was a really small source of income but over the years it has really started to add up. Think eBooks, affiliates, consulting, books, etc. and you’re starting to build an income stream.