What email service provider, course platform, and website platform do you recommend? If I'm using something that is not one of your recommendations, should I switch now?

If you're using something that you really like, stick with it! There's absolutely no reason to change it. 

If you're not using anything, you can check out my recommendations.Inside the “Start From Scratch” module, I’ve created Kickstart guides for all three types of software with comparison guides for different platforms. You can find this module in your course library.