It's absolutely fine to be a not-great UX designer. I'm also not a great UX designer.
The way you wrote and posted this article, there was an implication to me (and I'm guessing to others) that you think this design philosophy is better than what most other people are doing. The article would benefit from some qualifications, e.g.: "I'm still teaching myself UX and aesthetic design," for example. As it is, it comes across as a strong argument from someone who thinks he's an expert (and thinks other people's design decisions are wrong).
In terms of resources, you could take a full-semester class just about typography. Designing UIs is really hard and requires a ton of research. I've spent hundreds of hours over the last 10+ years just reading books and articles, and I still consider myself an amateur.
My strong recommendation is to pay someone who is great at UX and understands how to accommodate people with physical disabilities. Even people who are just 40+ years old (and not disabled in any way) are getting significantly less light coming through their retinas, and it's possible to choose fonts and colors that are difficult for them.
You can find someone who could revamp your stylesheet in a couple of days, and it shouldn't cost you more than $1k-$2k with the right person on Upwork.
You seem to be great at a lot of other things, so why not find someone who has equal depth at UX design? As a generalist myself, I often rely on specialists because it's truly impossible to be great at a large number of fields.
If you want to take a DIY, some good initial resources are:
- https://alistapart.com (note that its design is very functional and minimal, but still uses fonts, colors, and whitespace in a helpful way)
- https://www.smashingmagazine.com/category/ux-design/
- https://designmodo.com/design/ux-design/