I have a legacy e-commerce site heavily styled from the desktop era and have been making good money. They are based on a very sophisticated e-commerce software and it costs an arm and a leg to make the whole site responsive per present standards.
According to my GA analytics, I'm potentially letting go of thousands of dollars per month in sales with the majority of my site's traffic being mobile yet converting at less than half of conversion rate of the desktop traffic.
I will make the site responsive when I have more time but for now what's the single most important and easiest thing I can do to make the site more usable on mobile devices?
Considering iPhone Safari is pretty good at rendering desktop sites with regards to usability, I think responsive layout isn't the priority here.
My idea is to enlarging the font sizes of all the texts and sizes of all buttons, by, say 50%, for all mobile devices.
Would this work and make the mobile experience better if not perfect? What could be the potential problem for this very biased and partial approach?