You're throwing the word strategy too much I think and referring to it wrong.
-Wordpress is a great platform to create websites, and is hardly a negative as far as SEO goes. Although it is a good thing that you realize the possible implications and postponed development until you have a plan in place - hence the strategy being thrown too much, it seems you are figuring things out thus you cannot have a strategy in place, I think what you might have are goals, common mistake though.
-SEO is not all about keyword and their "ranking" in Google.
It has a lot more to do with general search marketing, the ranking of a website or individual pages within a website are calculated based on words, backlinks, social media uploads from third parties (users), the general location of the business, the areas Google knows you cover, amount of content within a page, how many links are coming out of each page, meta tags, a lot goes into SEO. That's why professionals always say that once you get started in working on your SEO it becomes a non-stop maintenance effort.
-Also creating landing pages alone won't necessarily improve your search and ranking because essentially those landing pages themselves would need to also have considerable ranking. If you use something like Instapages.com you wont have native tagging/keyword options for Google to crawl.
what some us do is allocate server spaces that essentially create and generate simple websites backlinking to each other, when you open them they are very plain and ugly but the crawlers see only how they each support each other and relevant to whatever search term and how they all backlink one way or another to the main website page you want to improve. Content will always be king, so keep that in mind you want completely annexed websites linking to the pages, you want people sharing that from all regions on their blogs and on their social networks, you want retweets and clicks, you might also want ppc... Think of it as an ecosystem (SEO) with each organism (pages/links/relevance/virality,etc) depending on each other but also each organism (pages/links/relevance/virality,etc) grow from something, its own source of life (your strategy/steps,measurable actions,rejections,risk aversion/embracement,etc.) creating that larger ecosystem (SEO).

Whatever you do, just keep in mind that wanting to create landing pages, improve seo, have individual products and service promotions doesn't make it a strategy. You have a set of goals. I have made a career in stepping into companies after other contractors/consultants have almost killed a business with unmeasurable effort, fluff words and high level jargon that leave business owners confused and with a halo effect on all other consultants. Strategy does not come easy and is unfortunately wrongly referenced. Once you figure out what goals you have (which you have) then you go into each goal and create a set of steps, paths, considerations, rules, expectations, rules for leadership to follow,etc. so that you can achieve those goals, know when to be risky and when not to, when resources must be allocated and how much, when to remove, reduce or add features or efforts... There is more to strategy than listing goals. You are off the the right start though, but don't consider that a strategy. From what you wrote, you just have goals. :)

My name is Humberto Valle, international strategist and cross functional business developer. I have a masters in business, focus on finance and have worked with amazing companies of all sizes in many industries, if you have any further questions please feel free to reach out. Also don't fall for your own 'ego', there are many other 'experts' that just pass opinion from something they read once or heard other say or went through once themselves and now share their opinions. There are a lot of good ones here and out there, but there are also a lot of bad ones. Clarity for example allows us 'experts' to generate free VIP links with discounts, but some use it as a way to make it look like they have more paid calls than they actually d but in reality they are just free links given to friends or clients on their own business, etc. If an expert is truly an expert they should have no problem answering your basic questions for free over the messaging feature. Dig deeper in conversation prior to paying for any consultation, extend the same to your clients. :)