Running progress deteriorating

Hi all - I’m newish you’re running. Before a couple months ago, I’d only run a 5k 2-3x in my life. Back in Jan, I signed up for a half marathon in Nov. My goal was to add 0.25 - 0.50 miles per week. I was doing really well until recently. I was consistently running at least 3 miles each run and had even worked up to 5 miles. Now I’m struggling to even do 1 mile. I already run really slow (4.7 mph on average).

Any thoughts on what’s going on or tips on how to improve? I’m getting discouraged.