To be generally accessible to those with visual impairment you need to replace the script font you used for your Title. Reading script is a dying art, and today's twenty-somethings, who grew up keyboarding, may not be able to read script at all.
Go with a larger, bolder, non-script non-serif font. Titles need Legibility (that you can make out the individual characters).
For your body text, you need to NOT use gray text. Use a dark solid color.
For body text in general, most authors favor Readability (a serif font, where the serifs help your eye track along the text). However, for a target audience of Readers who may have visual issues, there is a strong argument for Legibility instead, which you have provided by choosing a non-serif font.
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That's an interesting essay about your specific solutions for visual issues, but it falls far short of a general solution for many with limited vision.
You have not addressed that Seniors (who may not learn new methods as easily twenty-somethings) may have more difficulty managing the daunting complexity of the various and sundry hardware-assists.
Were you looking for additional suggestions of how to cope, or something else?