I have 20/20 vision (with some thick glasses), for what it's worth.

I don't like the the skin you linked to - it's easy to make out water versus land, but very difficult to see roads and street names.

I looked through a few pages, and I like Bright & Bubbly
https://snazzymaps.com/style/17/bright-and-bubbly

If you want black and white then this one looks good to me Muted Monotone
https://snazzymaps.com/style/91/muted-monotone

I have low vision and high contrast us the best. Color helps define shapes that are difficult to tell what they are. Also large print. If you zoom in the font should get larger!