Do you have stats you can work with? In my case, since start of 2017, only IE 11 has significant usage. Older versions are around 0.3% each, or let's say 1% total. I simply would not notice if they all just bounce of my home page.
Only problem you might have is if you work with B2B, and big customer shows up with IE8 requirement. Not very likely since it's no longer supported by Microsoft. And even then you can state although you have no problems with them using IE8 for their mission critical ActiveX app, they can install Chrome or FF for your app.