CQ DX! I also have an Amateur Extra ticket although it's been years since I've been active on the air.
Anyway, please report back what results you get at www.speedtest.net once you've made the changes discussed here. Assuming you get the results you're hoping for, knowing that may help other reading this thread in the future. And if for some reason moving your router and changing from wifi to hard wired doesn't do the trick, well, let's not go there unless necessary.