I mainly use IG as a gallery/portfolio. A lot of people (even actual customers) find and interact with me there. I don't live off photography, but I've almost made it a self-sustaining hobby.
For real interaction, sadly, the best option is to either post in X/Twitter/WhateverElonNamesItToday or Reddit. I suggest not doing it for the likes or whatever, they don't matter.
Never had any issue with that on my Nikons. I use the viewfinder while using my glasses. I can use the diopter, but my mild astigmatism still makes things look a little fuzzy without the glasses on.