I understand your frustration----I have macular degeneration and need large font and lots of contrast---but I have been able to enlarge the font size and the contrast by using the settings on my own Mac. See if this helps:
Yay google ...
Change font sizes within the Fonts window on Mac
- In an app on your Mac, choose Format > Show Fonts or Format > Font > Show Fonts.
- In the Fonts window, click the Action pop-up menu , choose Edit Sizes, then do any of the following: Add a font size: Type a new size, then click the Add button . ...
- Click Done.
https://support.apple.com/guide/mac-help/change-font-sizes-fonts-window-mac-mchlp2418/mac
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