If you're mentioning "less technical" I assume you're talking about tools? You can make good landing pages in Wordpress using a page builder like Elementor (just drag & drop).
You might need a bit of HTML/CSS here and there to customize things, but you should be able to get by without it.
I've been working on this for a product launch we are trying to do and have had the problem you are talking about.
The problem is that explaining that without ending up mired in detail is much harder than people give it credit. I've found it very useful to actually write out the list of what I am trying to convey and look at it constantly while doing design work.
Also splitting out the work - the first forays have been what I realized was actually development work that I was hiding behind design. During design I put away the dev environment and just work with sketches.
You might need a bit of HTML/CSS here and there to customize things, but you should be able to get by without it.