Answering your question here because I think it'll be easiest to see: For now I'm using Lighthouse to run accessibility checks. It's a tool built into google chrome and when you right click a webpage and select "inspect" you can select Lighthouse from the tabbed menu that appears on the right side of your screen. It'll tell you how to fix various issues. My recommendations page contains a link to an explanation.
Heads up: I've been getting curious about web accessibility and am playing around with a tool that scans my site for things to improve, so expect a bunch of updates that don't consist of visible changes (unless I'm addressing a contrast issue).