Ask HN: Fastest way to get recurring revenue with hosting?

I like startups and creating webapplications. But my main income (after working hours) is still selling websites / hosting or invoicing packages (=> customization of the invoice layout, configuring webapps, ...), which is like 85% of my income). The rest is mostly from hosting (webapps / websites)

I'm wondering, what do you sell to people (webapps, websites, cms), which contains hosting and is fairly easy to create a recurring revenue with?

And do you upsell? (eg. selling a website + email marketing application + affliate gmail for biz)