How to getting clients for my WordPress Maintenance Services?

First some personal feedback:

1. The sits looks really nice, very tight design and implementation.

2. You have possibly overbuilt the site. It has a bit of a "kitchen sink" feel to it... calculators, etc.

3. You may need to visually distinguish between some of your offer pages. I got a little confused because the pricing presentation of the Maintenance page and the Theme Install page looked identical, and I barely noticed that one page had "per month" and the other had "per site". Perhaps the purple color is the easiest element to change to keep those from looking too similar.

Your marketing options are really going to be determined by who your customers you want are... agencies? freelancers? the people who own the sites being developed or the techies making the sites for their clients?

You have created a detailed pricing model for your services but I'm not entirely sure who it maps to... Companies/devs have more than one site. How do you price that?

I'm a small agency, we host on WPEngine, can you provide services to techs like me? I know I'm getting a lot of business from companies who had a crap site built a few years ago, the game has changed and elevated, and they know JUST enough to know their site isn't technically proficient, but none of the details. Agencies like mine will rebuild their site, provide the analysis, strategy and launch/growth services to get them going... and of course we sell support when the launch is done :-).

I tell that story to ask... who you selling to? I think you have to consider when and why someone would need support, and who the other participants in that scenario happen to be.

What have you already tried in terms of marketing? Do you already have some clients?