You are using font size wrong. I see 13 lines of text per page and most lines has single word on it.

The solution is simple. If you don't know correct font size of every visitor, don't change the font size. Each visitor will have font set according to their preference. I will have set it to medium, my grandma to xx-large, teenager with perfect vision to small, designer with 8k monitors to 150px helvetica.

If you want to retain some control over the font size, use small, medium, large. (e.g. information dense site could use small, average website like yours could use medium, and information sparse websites like wedding announcement could use large).